Large and Unusual Gems
A Large Baroque Tridacna Gigas (Giant Clam) Pearl
Ruby in Diamond
A Chart for the Separation of Natural and Synthetic Diamonds
Oregon Sunstone Update
Conservation Concerns over Use of Tridacna Shell in Imitation Pearls
The New York lab investigates the use of the shells of Tridacna species as imitation pearls.
Visible Absorption Spectra of Colored Diamonds
Tucson: A Showcase of Colored Gemstone Innovation
Afghan Emerald, Tajik Ruby, and Clarity-Enhanced Tourmaline
Carbon Dioxide in a Brown Diamond
Two Foraminifera-Like Objects Found in a Natural Saltwater Pearl
Rare Natural Bicolor Diamond
A Remarkable 16.71 ct Transparent Orange-Yellow Sodalite
Cross in Natural Diamond
Chrysoberyl from the New England Placer Deposits, New South Wales, Australia
Examines a collection of chrysoberyl samples from these sapphire placer deposits to determine their distinct mineralogical and chemical properties.
Texas Topaz, Slovak Opal, a Beryl Inclusions Chart, and More
37th International Gemmological Conference
A report from the 37th IGC, held in late October 2023 in Tokyo.
Fall 2023 Auction Highlights
Large blue and pink diamonds were among the top lots of the fall auction season, including the most expensive auction jewel of 2023.
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