Large Natural Quahog Pearl
A purple non-nacreous specimen is revealed to be a natural northern quahog pearl.
Diamond in Diamond
A Fancy black round brilliant diamond has an inclusion that is revealed to be a natural diamond crystal.
Amethyst From Morocco:An Update
GIA’s Bangkok lab investigates the gemological properties of Moroccan amethyst.
Exceptional Red Spinels and Fine Aquamarine
Beautifully cut spinel and aquamarine was among the finds at Tucson’s GJX show.
Fine Corundum, Demantoid Garnet
Insight into the markets for ruby, sapphire, emerald, and other colored gems.
Ginger Garnet, “Fancy” Tanzanite
Garnets and a wide variety of tanzanite at the Tucson gem shows.
High-End Colored Gems
A unique assortment of colored gemstones as seen at the GJX show in Tucson.
Chinese Freshwater Pearl Culturing, Overall Market Summary
A review of Chinese freshwater cultured pearl production, with an update on the market for Tahitian, South Sea, and akoya cultured pearls.
HPHT Synthetic Diamond Melee in High-Quality Jewelry Piece (英语)
The New York lab discovers a synthetic melee diamond in a pendant, underscoring the importance of testing for undisclosed synthetics.
Large HPHT-Grown Synthetic Diamonds Examined in GIA’s Hong Kong Laboratory (英语)
Examination of the largest HPHT synthetic diamonds GIA has examined so far demonstrated significant progress in this growth technology.
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