Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.
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The phrase “light performance” gets a lot of loose use in the diamond trade, but what does it mean when someone is actually looking at a diamond?
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Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
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Opal’s play-of-colour is a lyrical dance: sometimes a grand jeté of bold, broad flashes of colour or smaller, quicksteps of pinpoint flashes.
Read MoreDrusy jewellery has surged in popularity in recent years. Celebrities wear it on the red carpet and designers clamour for it at gem shows.
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Learn the basics of the GIA Cut Grading System for round brilliant cut diamonds to help pick out your perfect diamond.
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Details the process used by Wiede’s Carbidwerk to produce star synthetic corundum from the mid-1950s until the 1970s.
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Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.
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Colombia’s unique trapiche emeralds exert a fascination for many gemmologists.
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An overview of the Spring 2016 Gems & Gemology content.
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