Chart: Inclusions in Natural, Synthetic, and Treated Sapphire
Provides a visual guide to the internal features of natural, synthetic, and treated sapphires.
Big Sky Country Sapphire: Visiting Montana’s Alluvial Deposits
Documents a visit to the upper Missouri River and Rock Creek sapphire mining areas.
Photoluminescence Mapping of Optical Defects in HPHT Synthetic Diamond
Demonstrates the importance of this method in identifying diamond treatments, based on the
analysis of PL maps acquired from a brownish orange HPHT synthetic diamond.
Christmas Tree–Shaped Internal Feature In Diamond
A laser manufacturing remnant in a Fancy yellow diamond creates a unique specimen.
Diamond with Unusual Fluorescence Distribution
A submission to the New York lab yields an unexpected reaction to long-wave UV radiation.
Dyed Yellow Beaded Freshwater Cultured Pearls Imitating South Sea Cultured Pearls
A yellow cultured pearl necklace is compared to the work of a producer specializing in freshwater pearls of all colors.
Partially Hollow Tridacna Blister Pearls with Shells Attached
Blister pearls attached to shells are seen in both the Bangkok and New York laboratories.
Sapphires from Northern Ethiopia
A new source of sapphires is found in the Tigray region of Ethiopia.
Quarterly Crystal: Molybdenite Phantoms in Quartz
Raman analysis identifies unusual inclusions in quartz.
A Synthetic Diamond Overgrowth on a Natural Diamond
Analysis of a diamond graded Fancy blue revealed a CVD synthetic overgrowth on natural diamond.
Colorful Chatoyant Glass
A devitrified glass reminiscent of Victoria Stone is seen during the Tucson gem shows.
GIA发现覆合钻石
Analysis of a diamond graded Fancy blue revealed a CVD synthetic overgrowth on natural diamond.
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