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An optical phenomenon exhibited in certain gemstones caused by alternating layers of different materials within the gem. As light hits these different elements with their different refractive indexes, it creates a beautiful optical effect. Sheen is best seen in gems such as Moonstone.
Sheen is different to lustre and brilliance. former is the return of light from the surface of the gem, while the latter is the return of light from within the gem.
The beautiful optical effect of sheen can be
seen in Moonstone.
GIA qualified Gemmologists
Members of the British Jewellery Association
Members of the Coloured Gemstone Assocation