Unique rough and faceted luminescent synthetic garnet-like crystals were on display at the 22nd Street show in Tucson.
Read More
The Antwerp lab examines CVD laboratory-grown diamonds where HPHT processing resulted in relatively low color grades.
Read More
Explores statistical data and defining characteristics of gem-quality CVD synthetic diamonds examined by GIA since 2003.
Read More
Examines a new source of colorless and near-colorless gem-quality HPHT synthetic diamonds using spectroscopic and gemological analysis.
Read More
Abstracts of speaker presentations from the “New Technologies and Techniques” session of GIA’s 2018 International Gemological Symposium.
Read More
Examination of the largest HPHT synthetic diamonds GIA has examined so far demonstrated significant progress in this growth technology.
Read More
Examines a form of asterism comprising two six-rayed stars, one white and one that exhibits the stone’s bodycolor. Firsthand accounts and a survey of patent documents reveal that diffusion has been used to create or enhance this optical phenomenon in synthetic and possibly natural corundum since the 1950s.
Read More
Two near-colorless rounds, weighing 3.23 and 2.51 ct, were the largest CVD-grown synthetic diamonds GIA has examined.
Read More
Results from GIA’s recent testing of a 10.08 ct blue HPHT synthetic diamond, the largest HPHT synthetic recorded to date.
Read More
Describes the chemical, morphological, and microscopic properties of the first gem-quality synthetic emeralds ever produced, offering a historical perspective on their development.
Read More
