Blue HPHT Synthetic Diamond Over 10 Carats
Results from GIA’s recent testing of a 10.08 ct blue HPHT synthetic diamond, the largest HPHT synthetic recorded to date.
CVD Synthetic Diamond Over 5 Carats Identified by GIA
Results from GIA’s recent testing of a 5.19 ct CVD synthetic diamond, the largest it has examined to date.
Update on Spectroscopy of “Gold Sheen” Sapphires
The chemical composition and spectroscopic characteristics of 14 gold sheen sapphires are examined.
Turquoise with Simulated Matrix
A turquoise bead is found to have an artificial pyrite and resin matrix.
Synthetic Sapphire and Synthetic Spinel Doublets
Unusual doublets created from two different synthetics are revealed at the Carlsbad laboratory.
Dyed Green Beryl
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