Irreversible Photochromism in Synthetic Sapphire
Rock Crystal Quartz Skull
Natural Non-Nacreous Pearls from Various Marine Mollusks
The Bangkok laboratory studies 35 loose non-nacreous pearls from a wide range of marine mollusk species.
Enormous South Sea Cultured Pearl with Filled and Partially Hollow Structure
Examination of a gigantic South Sea bead cultured pearl reveals an intriguing internal structure.
Assembled Bead Cultured Half-Pearl
Investigation in the Carlsbad laboratory reveals a pearl submission is not mabe as initially believed.
Black Opal with Unique Play-of-Color
A black opal cabochon set in a ring displays vivid orange play-of-color.
Fancy Vivid Yellow HPHT-Grown Diamonds
CVD Laboratory-Grown Gem Diamonds from Plasmability
CVD-Grown Diamond with an Unusual Blue Band
Checkered Pattern on Diamond
Rare Gem-Quality Viitaniemiite
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