Chameleon diamonds are among the rarest of gem diamonds.
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Summarises data collected on more than 15,000 natural blue/grey/violet diamonds examined by GIA during the last decade and examines the mechanisms that produce this colour range.
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Characterises a suite of 40 natural brown to black diamonds from this deposit so that they can be distinguished from suspected treated black diamonds.
Read MoreThe first substantiated identification of corundum (var. ruby) occurring as an inclusion in natural diamond is presented.
Read MoreAn aura of mystery has always surrounded these natural wonders, so it was quite an honour when GIA researchers examined these famous diamonds.
Read MoreThe author reports on a sudden influx of natural fancy pink diamonds and their origins.
Read MoreAn examination of seven CVD synthetic diamonds with an attractive pink colour.
Read MoreHigh-quality synthetic diamonds created by the Gemesis Corp. are examined and their gemmological properties are explicated.
Read MoreOne of the most popular exhibits at the Smithsonian Institution, the stunning Fancy Dark greyish blue Hope diamond was formally graded by GIA’s gem laboratory.
Read MoreExamines a 2.14 ct oval-cut diamond, graded as Fancy red, whose red colour was produced through a combination of high-presssure, high-temperature (HPHT) treatment and irradiation plus annealing.
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