Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.
Read MoreJaipur, India, is a leading emerald cutting and trading centre for the global gem and jewellery industry. See inside the industry with a GIA field team, and learn the intricacies of a business seldom seen by the public or most members of the industry.
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Graduate’s fascination with gems began in GIA’s warehouse and put him on a fast track to becoming an expert on Colombian emeralds.
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A sphere with unusual phosphorescence is seen in the Carlsbad laboratory.
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Report on a new cobalt diffusion treatment of natural spinel, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.
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Natural gemstones are typically far more valuable than synthetic ones, so being able to identify them correctly is a powerful skill.
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Analysis reveals blue lead glass filling in a sapphire that has an overall green bodycolour as a result of the filling’s combination with natural yellow colour.
Read MoreA simple test easily detected dye treatment in fire opal.
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A fingerprint pattern, possibly left by human skin oils during the assembly process, is observed in natural turquoise beads.
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A coral specimen that was coated - not dyed - with a colouring agent only on the surface, an unusual method evidenced by microscopic features.
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