Fall 2011

Lab Notes

Unusually Large CLINOHUMITE

DIAMOND
Black Diamond, Colored by Strong Plastic Deformation
Coated Black Diamond
Coated Diamond with Spectroscopic Features of a Natural-Color Pink
Colorless Untreated Diamonds with High Levels of Strain
HPHT Treatment for Subtle
Color Enhancement of Diamond
An Interesting Luminescent Cleavage in Diamond
A Large HPHT-Annealed Pink Diamond

SYNTHETIC DIAMOND
Gem-Quality CVD Synthetic Diamonds from Gemesis
Treated Synthetic Diamonds with Pink Color Intensified by Fluorescence

PEARL
Cultured Pearls from Pteria Sterna with Plastic Bead Nuclei
Large Conch Pearl

SAPPHIRE
Natural and Synthetic Green Sapphires with Similar Color but Remarkably Different Chromophores
Unusual Be-Diffused Pink Sapphire . . . A Cautionary Note
Unusually High Beryllium in Three Blue Sapphires

Purchase a PDF copy of this section.