1.
Crown (headgear)
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In art, the crown may be shown being offered to those on Earth by angels. In religious art, a crown of stars is used similarly to a halo, crowns worn by rulers often contain jewels. A crown is often an emblem of the monarchy, a monarchs government, the word itself is used, particularly in Commonwealth countries, as an abstract name for the monarchy itself, as distinct from the individual who inhabits it. A specific type of crown is employed in heraldry under strict rules, costume headgear imitating a monarchs crown is also called a crown. Such costume crowns may be worn by actors portraying a monarch, people at parties, or ritual monarchs such as the king of a Carnival krewe. The nuptial crown, sometimes called a coronal, worn by a bride, in the present day, it is most common in Eastern Orthodox cultures. The Eastern Orthodox marriage service has a section called the crowning, wherein the bride and groom are crowned as king, in Greek weddings, the crowns are diadems usually made of white flowers, synthetic or real, often adorned with silver or mother of pearl. They are placed on the heads of the newlyweds and are held together by a ribbon of white silk and they are then kept by the couple as a reminder of their special day. In Slavic weddings, the crowns are made of ornate metal, designed to resemble an imperial crown. A parish usually owns one set to use for all the couples that are married there since these are more expensive than Greek-style crowns. This was common in Catholic countries in the past, a Crown of thorns according to the Bible, was placed on the head of Jesus before his crucifixion and has become a common symbol of martyrdom. According to Roman Catholic tradition, the Blessed Virgin Mary was crowned as Queen of Heaven after her assumption into heaven and she is often depicted wearing a crown, and statues of her in churches and shrines are ceremonially crowned during May. The Crown of Immortality is also common in historical symbolism, dancers of certain traditional Thai dances often wear crowns on their head. These are inspired in the worn by deities and by kings. Three distinct categories of crowns exist in those monarchies that use crowns or state regalia, coronation, worn by monarchs when being crowned. State, worn by monarchs on other state occasions, consort crowns, worn by queens consort, signifying rank granted as a constitutional courtesy protocol. In Classical antiquity, the crown that was awarded to people other than rulers, such as triumphal military generals or athletes, was actually a wreath or chaplet. Numerous crowns of various forms were used in antiquity, such as the Hedjet, Deshret, the Pschent double crown and it was referred to as the chaplet studded with sunbeams” by Lucian, about 180 AD
2.
Bohemian Crown Jewels
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They were originally held in Prague and Karlštejn Castle, designed in the 14th century by Matthias of Arras. Since 1791 they have stored in St. Vitus Cathedral at Prague Castle. Reproductions of the jewels are permanently exhibited in the exposition at the former royal palace in the castle. The crown was made for the coronation of Charles IV in 1347, the crown has an unusual design, with vertical fleurs-de-lis standing at the front, back and sides. Made from 22-carat gold and a set of precious 19 sapphires,30 emeralds,44 spinels,20 pearls,1 ruby,1 rubellite and 1 aquamarine, at the top of the crown is the cross, which reportedly stores a thorn from Christs crown of thorns. The Royal sceptre is made from 18-carat gold,4 sapphires,5 spinels and 62 pearls with an extra large spinel mounted on top of the sceptre, the Royal orb is also made from 18-carat gold,8 sapphires,6 spinels and 31 pearls. It weighs 780g and is decorated with relief scenes from the Old Testament. The Coronation robe was used from 1653 until 1836 and it is made from precious silky red material called zlatohlav and is lined with ermine. The robe is stored separately from jewelry in an air conditioned repository. For the coronation ceremonies, St. Wenceslas sword, a typical Gothic weapon, was used, the iron blade length is 76 cm, at the widest point is 45 mm and has a ripped hole in a cross shape. The wooden handle is covered with fabric and velvet embroidered with the ornament of laurel twigs with thick silver thread. After coronation ceremonies, the sword was used for the purpose of granting knighthoods, the oldest leather case for the crown was made for Charles IV in 1347. On top are inscribed four symbols, the Imperial eagle, Bohemian lion, the door to Crown Jewels chamber, and likewise the iron safe, is hardly accessible and has seven locks. Vitus Cathedral and the Mayor of Prague, who must all convene to facilitate opening the impenetrable door, the crown is named and dedicated after the Duke St. Wenceslaus of the Přemyslids dynasty of Bohemia. The jewels should be stored in the chapel of St. Wenceslaus in St. Vitus. They were only lent to Kings, and only on the day of the coronation, after 1918 and the establishment of the Czechoslovak Republic the Coronation Jewels ceased to serve their original function, but remained important as symbols of national independence and statehood. In the past, the Jewels were kept in different places, Wenceslaus IV probably moved them to Karlštejn Castle. While the Jewels were stored in Vienna, the original gold orb, the new orb and sceptre probably originated with an order by Ferdinand I in 1533
3.
Bohemia
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Bohemia is the westernmost and largest historical region of the Czech lands in the present-day Czech Republic. Bohemia was a duchy of Great Moravia, later an independent principality, a kingdom in the Holy Roman Empire, and subsequently a part of the Habsburg Monarchy, after World War I and the establishment of an independent Czechoslovak state, Bohemia became a part of Czechoslovakia. Between 1938 and 1945, border regions with sizeable German-speaking minorities of all three Czech lands were joined to Nazi Germany as the Sudetenland, in 1990, the name was changed to the Czech Republic, which become a separate state in 1993 with the dissolution of Czechoslovakia. Until 1948, Bohemia was a unit of Czechoslovakia as one of its lands. Bohemia was bordered in the south by Upper and Lower Austria, in the west by Bavaria and in the north by Saxony and Lusatia, in the northeast by Silesia, and in the east by Moravia. In the 2nd century BC, the Romans were competing for dominance in northern Italy, the Romans defeated the Boii at the Battle of Placentia and the Battle of Mutina. After this, many of the Boii retreated north across the Alps, much later Roman authors refer to the area they had once occupied as Boiohaemum. The earliest mention was by Tacitus Germania 28, and later mentions of the name are in Strabo. The name appears to include the tribal name Boi- plus the Germanic element *haimaz home and this Boiohaemum was apparently isolated to the area where King Marobods kingdom was centred, within the Hercynian forest. The Czech name Čechy is derived from the name of the Slavic ethnic group, the Czechs, Bohemia, like neighbouring Bavaria, is named after the Boii, who were a large Celtic nation known to the Romans for their migrations and settlement in northern Italy and other places. Another part of the nation moved west with the Helvetii into southern France, to the south, over the Danube, the Romans extended their empire, and to the southeast in Hungaria, were Sarmatian peoples. In the area of modern Bohemia the Marcomanni and other Suebic groups were led by their king Marobodus and he took advantage of the natural defenses provided by its mountains and forests. In late classical times and the early Middle Ages, two new Suebic groupings appeared to the west of Bohemia in southern Germany, the Alemanni, many Suebic tribes from the Bohemian region took part in such movements westwards, even settling as far away as Spain and Portugal. With them were also tribes who had pushed from the east, such as the Vandals, other groups pushed southwards towards Pannonia. These are precursors of todays Czechs, though the amount of Slavic immigration is a subject of debate. The Slavic influx was divided into two or three waves, the first wave came from the southeast and east, when the Germanic Lombards left Bohemia. Soon after, from the 630s to 660s, the territory was taken by Samos tribal confederation and his death marked the end of the old Slavonic confederation, the second attempt to establish such a Slavonic union after Carantania in Carinthia. Other sources divide the population of Bohemia at this time into the Merehani, Marharaii, Beheimare, Christianity first appeared in the early 9th century, but only became dominant much later, in the 10th or 11th century
4.
Holy Roman Emperor
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The Holy Roman Emperor was the ruler of the Holy Roman Empire. From an autocracy in Carolingian times the title evolved into an elected monarchy chosen by the Prince-electors, until the Reformation the Emperor elect was required to be crowned by the Pope before assuming the imperial title. The title was held in conjunction with the rule of the Kingdom of Germany, in theory, the Holy Roman Emperor was primus inter pares among the other Catholic monarchs, in practice, a Holy Roman Emperor was only as strong as his army and alliances made him. Various royal houses of Europe, at different times, effectively became hereditary holders of the title, after the Reformation many of the subject states and most of those in Germany were Protestant while the Emperor continued to be Catholic. The Holy Roman Empire was dissolved by the last Emperor as a result of the collapse of the polity during the Napoleonic wars, from the time of Constantine I the Roman emperors had, with very few exceptions, taken on a role as promoters and defenders of Christianity. In the west, the title of Emperor was revived in 800, as the power of the papacy grew during the Middle Ages, popes and emperors came into conflict over church administration. The best-known and most bitter conflict was known as the Investiture Controversy. After Charlemagne was crowned Emperor of the Romans by Pope Leo III, no pope appointed an emperor again until the coronation of Otto the Great in 962. Under Otto and his successors, much of the former Carolingian kingdom of Eastern Francia fell within the boundaries of the Holy Roman Empire, the various German princes elected one of their peers as King of the Germans, after which he would be crowned as emperor by the Pope. After Charles Vs coronation, all succeeding emperors were called elected Emperor due to the lack of papal coronation, the term sacrum in connection with the medieval Roman Empire was first used in 1157 under Frederick I Barbarossa. Charles V was the last Holy Roman Emperor to be crowned by the Pope, the final Holy Roman Emperor-elect, Francis II, abdicated in 1806 during the Napoleonic Wars that saw the Empires final dissolution. The standard designation of the Holy Roman Emperor was August Emperor of the Romans, the word Holy had never been used as part of that title in official documents. In German-language historiography, the term Römisch-deutscher Kaiser is used to distinguish the title from that of Roman Emperor on one hand, the English term Holy Roman Emperor is a modern shorthand for emperor of the Holy Roman Empire not corresponding to the historical style or title. Successions to the kingship were controlled by a variety of complicated factors, elections meant the kingship of Germany was only partially hereditary, unlike the kingship of France, although sovereignty frequently remained in a dynasty until there were no more male successors. The Electoral council was set at seven princes by the Golden Bull of 1356, another elector was added in 1690, and the whole college was reshuffled in 1803, a mere three years before the dissolution of the Empire. After 1438, the Kings remained in the house of Habsburg and Habsburg-Lorraine, with the exception of Charles VII. Maximilian I and his successors no longer travelled to Rome to be crowned as Emperor by the Pope, Maximilian therefore named himself Elected Roman Emperor in 1508 with papal approval. This title was in use by all his uncrowned successors, of his successors only Charles V, the immediate one, received a papal coronation
5.
Charles IV, Holy Roman Emperor
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Charles IV, born Wenceslaus, was a King of Bohemia and the first King of Bohemia to also become Holy Roman Emperor. He was a member of the House of Luxembourg from his fathers side and the House of Přemyslid from his mothers side and he was the eldest son and heir of King John of Bohemia, who died at the Battle of Crécy on 26 August 1346. Charles inherited the County of Luxembourg from his father and was elected king of the Kingdom of Bohemia, on 2 September 1347, Charles was crowned King of Bohemia. On 11 July 1346, the prince-electors chose him as King of the Romans in opposition to Emperor Louis IV, Charles was crowned on 26 November 1346 in Bonn. After his opponent died, he was re-elected in 1349 and crowned King of the Romans, in 1355 he was crowned King of Italy and Holy Roman Emperor. With his coronation as King of Burgundy in 1365, he became the ruler of all the kingdoms of the Holy Roman Empire. Charles IV was born to King John of the Luxembourg dynasty and he was originally named Wenceslaus, the name of his maternal grandfather, King Wenceslaus II. He chose the name Charles at his confirmation in honor of his uncle, King Charles IV of France and he received French education and was literate and fluent in five languages, Latin, Czech, German, French, and Italian. In 1331 he gained experience of warfare in Italy with his father. At the beginning of 1333, Charles went to Lucca to consolidate his rule there, in an effort to defend the city, Charles founded the nearby fortress and the town of Montecarlo. From 1333 he administered the lands of the Bohemian Crown due to his fathers frequent absence, in 1334, Charles was named Margrave of Moravia, the traditional title for heirs to the throne. Two years later, he assumed the government of Tyrol on behalf of his brother, John Henry, as he had previously promised to be subservient to Clement, he made extensive concessions to the pope in 1347. Confirming the papacy in the possession of vast territories, he promised to annul the acts of Louis against Clement, to no part in Italian affairs. Charles IV was in a weak position in Germany. Owing to the terms of his election, he was referred to as a Priests King. Many bishops and nearly all of the Imperial cities remained loyal to Louis the Bavarian, civil war in Germany was prevented, however, when Louis IV died on 11 October 1347, after suffering a stroke during a bear hunt. Thereafter, Charles faced no direct threat to his claim to the Imperial throne, Charles initially worked to secure his power base. Bohemia had remained untouched by the plague, Prague became his capital, and he rebuilt the city on the model of Paris, establishing the New Town
6.
Wenceslaus I, Duke of Bohemia
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Wenceslaus I, Wenceslas I, Václav the Good or Saint Wenceslaus was the duke of Bohemia from 921 until his assassination in 935. His younger brother, Boleslaus the Cruel, was complicit in the murder and his martyrdom and the popularity of several biographies gave rise to a reputation for heroic goodness that resulted in his elevation to sainthood. He was posthumously declared to be a king and came to be seen as the saint of the Czech state. He is the subject of the well-known Good King Wenceslas, a carol for Saint Stephens Day, Wenceslas was the son of Vratislaus I, Duke of Bohemia from the Přemyslid dynasty. His grandfather, Bořivoj I of Bohemia, was converted to Christianity by Saints Cyril and his mother, Drahomíra, was the daughter of a pagan tribal chief of the Havelli, but was baptized at the time of her marriage. His paternal grandmother, Ludmila of Bohemia, oversaw his education, in 921, when Wenceslas was about thirteen, his father died and his grandmother became regent. Jealous of the influence that Ludmila wielded over Wenceslas, Drahomíra arranged to have her killed, Ludmila was at Tetín Castle near Beroun when assassins murdered her on September 15,921. She is said to have been strangled by them with her veil. She was at first buried in the church of St. Michael at Tetín, but her remains were removed, probably by Wenceslas, to the church of St. George in Prague. Drahomíra then assumed the role of regent and immediately initiated measures against the Christians, when Wenceslas came of age, he took control of the government. He placed the duchy under the protection of Germany, introduced German priests, and favoured the Latin rite instead of the old Slavic, to prevent disputes between him and his younger brother Boleslav, they divided the country between them, assigning to the latter a considerable territory. To withstand Saxon overlordship, Wenceslass father Vratislaus had forged an alliance with the Bavarian duke Arnulf, the alliance became worthless, however, when Arnulf and Henry reconciled at Regensburg in 921. In 924 or 925, at about the age of 18 and he then defeated a rebellious duke of Kouřim named Radslav. He also founded a rotunda consecrated to St. Vitus at Prague Castle in Prague, Henry had been forced to pay a huge tribute to the Magyars in 926 and needed the Bohemian tribute, which Wenceslas probably refused to pay after the reconciliation between Arnulf and Henry. Another possible reason for the attack was the formation of the alliance between Bohemia, the Polabian Slavs, and the Magyars. In September 935, a group of nobles allied with Wenceslass younger brother Boleslav plotted to kill him. After Boleslav invited Wenceslas to the feast of Saints Cosmas and Damian in Stará Boleslav, three of Boleslavs companions, Tira, Česta, and Hněvsa, fell on the duke, as the duke fell, Boleslav ran him through with a lance. According to Cosmas of Prague, in his Chronica Boëmorum of the early 12th century, because of the ominous circumstance of his birth, the infant was named Strachkvas, which means a dreadful feast
7.
Gold
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Gold is a chemical element with symbol Au and atomic number 79. In its purest form, it is a bright, slightly yellow, dense, soft, malleable. Chemically, gold is a metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions, Gold often occurs in free elemental form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the element silver and also naturally alloyed with copper. Less commonly, it occurs in minerals as gold compounds, often with tellurium, golds atomic number of 79 makes it one of the higher numbered, naturally occurring elements. It is thought to have produced in supernova nucleosynthesis, from the collision of neutron stars. Because the Earth was molten when it was formed, almost all of the present in the early Earth probably sank into the planetary core. Gold is resistant to most acids, though it does dissolve in aqua regia, a mixture of acid and hydrochloric acid. Gold also dissolves in solutions of cyanide, which are used in mining and electroplating. Gold dissolves in mercury, forming amalgam alloys, but this is not a chemical reaction, as a precious metal, gold has been used for coinage, jewelry, and other arts throughout recorded history. A total of 186,700 tonnes of gold is in existence above ground, the world consumption of new gold produced is about 50% in jewelry, 40% in investments, and 10% in industry. Gold is also used in infrared shielding, colored-glass production, gold leafing, certain gold salts are still used as anti-inflammatories in medicine. As of 2014, the worlds largest gold producer by far was China with 450 tonnes, Gold is cognate with similar words in many Germanic languages, deriving via Proto-Germanic *gulþą from Proto-Indo-European *ǵʰelh₃-. The symbol Au is from the Latin, aurum, the Latin word for gold, the Proto-Indo-European ancestor of aurum was *h₂é-h₂us-o-, meaning glow. This word is derived from the root as *h₂éu̯sōs, the ancestor of the Latin word Aurora. This etymological relationship is presumably behind the frequent claim in scientific publications that aurum meant shining dawn, Gold is the most malleable of all metals, a single gram can be beaten into a sheet of 1 square meter, and an avoirdupois ounce into 300 square feet. Gold leaf can be thin enough to become semi-transparent
8.
Gemstone
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A gemstone is a piece of mineral crystal which, in cut and polished form, is used to make jewelry or other adornments. However, certain rocks or organic materials that are not minerals are used for jewelry and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their luster or other properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone, apart from jewelry, from earliest antiquity engraved gems and hardstone carvings, such as cups, were major luxury art forms. A gem maker is called a lapidary or gemcutter, a worker is a diamantaire. The carvings of Carl Fabergé are significant works in this tradition, the traditional classification in the West, which goes back to the ancient Greeks, begins with a distinction between precious and semi-precious, similar distinctions are made in other cultures. In modern usage the precious stones are diamond, ruby, sapphire, other stones are classified by their color, translucency and hardness. Another unscientific term for semi-precious gemstones used in art history and archaeology is hardstone, in modern times gemstones are identified by gemologists, who describe gems and their characteristics using technical terminology specific to the field of gemology. The first characteristic a gemologist uses to identify a gemstone is its chemical composition, for example, diamonds are made of carbon and rubies of aluminium oxide. Next, many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic, another term used is habit, the form the gem is usually found in. For example, diamonds, which have a crystal system, are often found as octahedrons. Gemstones are classified into different groups, species, and varieties, for example, ruby is the red variety of the species corundum, while any other color of corundum is considered sapphire. Other examples are the Emerald, aquamarine, red beryl, goshenite, heliodor, and morganite, gems are characterized in terms of refractive index, dispersion, specific gravity, hardness, cleavage, fracture, and luster. They may exhibit pleochroism or double refraction and they may have luminescence and a distinctive absorption spectrum. Material or flaws within a stone may be present as inclusions, gemstones may also be classified in terms of their water. This is a grading of the gems luster, transparency. Very transparent gems are considered first water, while second or third water gems are those of a lesser transparency, there is no universally accepted grading system for gemstones. Diamonds are graded using a system developed by the Gemological Institute of America in the early 1950s, historically, all gemstones were graded using the naked eye
9.
Sapphire
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Sapphire is a gemstone, a variety of the mineral corundum, an aluminium oxide. It is typically blue in color, but natural fancy sapphires also occur in yellow, purple, orange, the only color which sapphire cannot be is red - as red colored corundum is called ruby, another corundum variety. This variety in color is due to amounts of elements such as iron, titanium, chromium, copper. Commonly, natural sapphires are cut and polished into gemstones and worn in jewelry and they also may be created synthetically in laboratories for industrial or decorative purposes in large crystal boules. Sapphire is the birthstone for September and the gem of the 45th anniversary, a sapphire jubilee occurs after 65 years. Sapphire is one of the two gem-varieties of corundum, the other being ruby, although blue is the best-known sapphire color, they occur in other colors, including gray and black, and they can be colorless. A a pinkish orange variety of sapphire is called padparadscha, significant sapphire deposits are found in Eastern Australia, Thailand, Sri Lanka, China, Madagascar, East Africa, and in North America in a few locations, mostly in Montana. Sapphire and rubies are often found in the geological setting. Every sapphire mine produces a range of quality - and origin is not a guarantee of quality. For sapphire, Kashmir receives the highest premium although Burma, Sri Lanka, the cost of natural sapphires varies depending on their color, clarity, size, cut, and overall quality. For gems of exceptional quality, an independent determination from a respected laboratory such as the GIA, gemstone color can be described in terms of hue, saturation, and tone. Hue is commonly understood as the color of the gemstone, saturation refers to the vividness or brightness of the hue, and tone is the lightness to darkness of the hue. Blue sapphire exists in various mixtures of its primary and secondary hues, various tonal levels, blue sapphires are evaluated based upon the purity of their primary hue. Purple, violet, and green are the most common secondary hues found in blue sapphires, violet and purple can contribute to the overall beauty of the color, while green is considered to be distinctly negative. Blue sapphires with up to 15% violet or purple are generally said to be of fine quality, gray is the normal saturation modifier or mask found in blue sapphires. Gray reduces the saturation or brightness of the hue, and therefore has a negative effect. The 423-carat Logan sapphire in the National Museum of Natural History, in Washington, sapphires in colors other than blue are called fancy or parti colored sapphires. Fancy sapphires are found in yellow, orange, green sapphires, brown, purple
10.
Ruby
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A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum. Other varieties of gem-quality corundum are called sapphires, Ruby is one of the traditional cardinal gems, together with amethyst, sapphire, emerald, and diamond. They word ruby comes from ruber, Latin for red, the color of a ruby is due to the element chromium. The quality of a ruby is determined by its color, cut, and clarity, the brightest and most valuable red called blood-red or pigeon blood, commands a large premium over other rubies of similar quality. After color follows clarity, similar to diamonds, a stone will command a premium. Ruby is the birthstone for July and is usually more pink than garnet. The worlds most expensive ruby is the Sunrise Ruby, rubies have a hardness of 9.0 on the Mohs scale of mineral hardness. Among the natural gems only moissanite and diamond are harder, with diamond having a Mohs hardness of 10.0, when a chromium atom replaces an occasional aluminum atom, it too loses 3 electrons to become a chromium3+ ion to maintain the charge balance of the Al2O3 crystal. However, the Cr3+ ions are larger and have electron orbitals in different directions than aluminum, the octahedral arrangement of the O2− ions is distorted, and the energy levels of the different orbitals of those Cr3+ ions are slightly altered because of the directions to the O2− ions. Those energy differences correspond to absorption in the ultraviolet, violet, if one percent of the aluminum ions are replaced by chromium in ruby, the yellow-green absorption results in a red color for the gem. Additionally, absorption at any of the above wavelengths stimulates fluorescent emission of 694-nanometer-wavelength red light, after absorbing short-wavelength light, there is short interval of time when the crystal lattice of ruby is in an excited state before fluorescence occurs. If 694-nanometer photons pass through the crystal during that time, they can stimulate more fluorescent photons to be emitted in-phase with them, thus strengthening the intensity of that red light. By arranging mirrors or other means to pass emitted light repeatedly through the crystal, all natural rubies have imperfections in them, including color impurities and inclusions of rutile needles known as silk. Gemologists use these needle inclusions found in natural rubies to distinguish them from synthetics, simulants, usually, the rough stone is heated before cutting. These days, almost all rubies are treated in some form, untreated rubies of high quality command a large premium. Some rubies show a three-point or six-point asterism or star and these rubies are cut into cabochons to display the effect properly. Asterisms are best visible with a source and move across the stone as the light moves or the stone is rotated. Such effects occur when light is reflected off the silk in a certain way and this is one example where inclusions increase the value of a gemstone
11.
Emerald
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Emerald is a gemstone and a variety of the mineral beryl colored green by trace amounts of chromium and sometimes vanadium. Beryl has a hardness of 7. 5–8 on the Mohs scale, most emeralds are highly included, so their toughness is classified as generally poor. The word emerald is derived, from Vulgar Latin, esmaralda/esmaraldus, a variant of Latin smaragdus, emeralds, like all colored gemstones, are graded using four basic parameters–the four Cs of Connoisseurship, Color, Clarity, Cut and Carat weight. Before the 20th century, jewelers used the water, as in a gem of the finest water. Normally, in the grading of colored gemstones, color is by far the most important criterion, however, in the grading of emeralds, clarity is considered a close second. A fine emerald must possess not only a pure verdant green hue as described below, in the 1960s, the American jewelry industry changed the definition of emerald to include the green vanadium-bearing beryl as emerald. As a result, vanadium emeralds purchased as emeralds in the United States are not recognized as such in the UK, in America, the distinction between traditional emeralds and the new vanadium kind is often reflected in the use of terms such as Colombian Emerald. In gemology, color is divided into three components, hue, saturation, and tone, emeralds occur in hues ranging from yellow-green to blue-green, with the primary hue necessarily being green. Yellow and blue are the normal secondary hues found in emeralds, only gems that are medium to dark in tone are considered emerald, light-toned gems are known instead by the species name green beryl. The finest emerald are approximately 75% tone on a scale where 0% tone would be colorless, in addition, a fine emerald should be well saturated and have a hue that is bright. Gray is the normal saturation modifier or mask found in emerald, Emerald tends to have numerous inclusions and surface breaking fissures. Unlike diamond, where the standard, i. e. 10× magnification, is used to grade clarity. Thus, if an emerald has no visible inclusions to the eye it is considered flawless, stones that lack surface breaking fissures are extremely rare and therefore almost all emeralds are treated to enhance the apparent clarity. The inclusions and fissures within an emerald are sometime described as jardin, imperfections are unique for each emerald and can be used to identify a particular stone. Eye-clean stones of a vivid primary green hue, with no more than 15% of any hue or combination of a medium-dark tone. The relative non-uniformity motivates the cutting of emeralds in cabochon form, faceted emeralds are most commonly given an oval cut, or the signature emerald cut, a rectangular cut with facets around the top edge. Most emeralds are oiled as part of the process, in order to fill in surface-reaching cracks so that clarity and stability are improved. Cedar oil, having a refractive index, is often used in this widely adopted practice
