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Zigzag Fingerprint in Sri Lankan Sapphire
Fiber-optic illumination reveals rectilinear zigzag-patterned films with vibrant colors in a blue sapphire.
Ukrainian Pegmatitic Heliodor and Topaz
Assembled Bead Cultured Half-Pearl
Enormous Cat’s-Eye Aquamarine
Iridescent Pen Shell
Heat Treating Corundum: The Bangkok Operation
Spectral Reflectance and Fluorescence Characteristics of Natural-Color and Heat-Treated “Golden” South Sea Cultured Pearls
A comparison study was made between the yellow and white nacre of the gold-lipped Pinctada maxima oyster shell and 65 yellow cultured pearls.
Eighth Annual Gianmaria Buccellati Foundation Award Winner
HPHT-Processed Diamond Fraudulently Represented as Untreated
An HPHT-treated round brilliant diamond with an inscription that presents as a GIA report number is found to be inconsistent with the institute's report, previously issued for an untreated diamond.
Dendritic Patterns in Emerald
