Diadem
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A diadem was an ornamental headband, and later became a metal crown, worn by monarchs and others as a badge of royalty.
Coin of Antiochus III the Great of the Seleucid Empire, shown wearing a diadem, which was a type of headband tied around the head. Greek inscription reads ΒΑΣΙΛΕΩΣ ΑΝΤΙΟΧΟΥ, "of King Antiochus".
Gold and silver diadem of Philip II of Macedonia. This is one type of diadem used by Macedonian and Hellenistic rulers.
Gold diadem. Greek, probably made in Alexandria, Egypt, and belonging to a noblewoman of the Ptolemaic dynasty (220–100 BC): the clasp is shaped as a Herakles knot
Gold diadem. India, 9th–10th century
Crown
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A crown is a traditional form of head adornment, or hat, worn by monarchs as a symbol of their power and dignity. A crown is often, by extension, a symbol of the monarch's government or items endorsed
Diadem
…A diadem was an ornamental headband, and later became a metal crown, worn by monarchs and others as a badge of royalty. The word derives from the Greek διάδημα diádēma, "band" or "fillet", from διαδέω diadéō, "to bind…
St Edward's Crown (1661), used for the coronation of English monarchs and, from 1707, British monarchs, to the present day.
Crown of King of Persis Ardakhshir II, 1st century BC.
The Iron Crown of Lombardy.
Shripech, the royal crown of the Kingdom of Nepal.