Gemology
Videos
Gemology or gemmology is the science dealing with natural and artificial gemstone materials. It is a specific interdisciplinary branch of mineralogy. Some jewelers are academically trained gemologists
Examining a pink sapphire under a gemmological microscope
Gemmological travel lab KA52KRS
A selection of ornamental, non-precious stones made by tumbling rough pebbles with abrasive grit in a rotating drum. The biggest pebble here is 40 millimetres (1.6 in) long.
Traditional handheld refractometer
Refractometer
Videos
A refractometer is a laboratory or field device for the measurement of an index of refraction. The index of refraction is calculated from the observed refraction angle using Snell's law. For mixtures,
Hand-held refractometer
Bausch & Lomb Abbe Refractometer, ca. 1919–1926
Gemology refractometer ER604 used to test light bending in gemstones; courtesy of A.KRÜSS Optronic GmbH