Spring 2000 Gem News International
A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewelry manufacturing techniques, and industry trends.
Non-Bead-Cultured Pearls from Pinctada margaritifera
GIA’s Bangkok laboratory examined the internal and spectroscopic features of 120 cultured pearl samples, all stated to be non-bead-cultured pearls of “Tahitian” origin. Most showed spectral features that suggest they were produced by the Pinctada margaritifera mollusk, though some were bead-cultured pearls were mixed in with the samples.
Real-Time Microradiography of Pearls: A Comparison Between Detectors
Compares the image quality provided by real-time microradiographic imaging (RTX) units fitted with two different detectors: an image intensifier (II) and a flat panel detector (FPD).
Filled Pearl with Surface Features
A pearl, thought to be natural, is revealed to be a bead-cultured specimen with a pre-drilled nucleus.
Natural Freshwater “Fish” Pearl
A uniquely shaped freshwater pearl is examined in the New York lab.
A Melee-Sized CVD Synthetic Diamond in Pearl and Diamond Jewelry
A CVD-grown melee is found in a pearl and diamond earring.
Natural Conch “Rosebud” Pearls
Unique natural conch pearls are studied in the New York lab.
Partially Hollow Tridacna Blister Pearls with Shells Attached
Blister pearls attached to shells are seen in both the Bangkok and New York laboratories.
Atypical Bead-Cultured Pearls with Unusual Nacre Growth
Bead-cultured pearls with growth patterns within the drill holes are seen in the New York lab.
“Sango Pearl” from Japan
A study of a pink Japanese akoya cultured pearl yields information about the material’s color origin.