Garnet in Sapphire
A large orange garnet forms a rare and beautiful inclusion in a color-change sapphire.
Jewels from Imperial St. Petersburg
By Ulla Tillander-Godenhielm, 295 pp., illus. publ. by Unicorn Press, London, 2012. US$80.00
Green Kyanite
At the Riverpark Inn show in Tucson, gem dealer Tom Schneider (San Diego, California) exhibited a parcel of kyanite displaying an unusual saturated yellowish green color.
Imitation Larimar
Strands of Tiny Akoya Keshi Pearls
A Large Irradiated Green-Yellow Diamond
Unusual Curved Color Zoning In Emerald
X-ray Computed Microtomography Applied to Pearls: Methodology, Advantages, and Limitations
X-ray computed microtomography reveals the internal features of pearls with great detail.
X-ray Computed Microtomography: Distinguishing Natural Pearls from Beaded and Non-Beaded Cultured Pearls
The distinction of natural from cultured pearls traditionally has been based on X-radiography.
GIA Museum Exhibits in New York
A brief look at GIA's permanent museum exhibit at the New York lab and campus.
Cat’s-Eye Calcite from Pakistan
Diamond-Bearing Eclogite Xenoliths from the Ardo So Ver Dykes
Mineralogical examination of diamond-bearing material from South Africa reveals the specimens to be eclogite xenoliths.
Purple Scapolite
2015 Sinkankas Symposium
Opal was the focus of the April 2015 Sinkankas Symposium at GIA’s Carlsbad, California campus.
An Unusual Filled Ruby
Rare Type IIb Gray-Purple Diamond
A natural type IIb diamond with rare color and very strong 776.4 nm PL peak is seen at the Carlsbad lab.
Prasiolite with Inclusion Influenced by Brazil-Law Twinning
A prasiolite specimen displaying Brazil-law twinning, usually seen in the amethyst variety of quartz, is examined.
Pyrex Bracelets
Dyed Bone as a Red Coral Imitation
A specimen presenting as red coral is revealed to be dyed bone.
Shattuckite from the DRC
Rare shattuckite from the Democratic Republic of Congo, as seen at the Tucson Gem and Mineral Show.
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