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.
Synthetic Sapphire and Synthetic Spinel Doublets
Unusual doublets created from two different synthetics are revealed at the Carlsbad laboratory.
Turquoise with Simulated Matrix
A turquoise bead is found to have an artificial pyrite and resin matrix.
Update on Spectroscopy of “Gold Sheen” Sapphires
The chemical composition and spectroscopic characteristics of 14 gold sheen sapphires are examined.
Mixing of Natural Diamonds with HPHT Synthetic Melee
Screening reveals a surprise within a batch of synthetic diamond melee.
Coesite Inclusions with Filaments in Diamond
Inclusions with unusual formation are found in a treated Fancy Vivid yellow diamond.
Decay Kinetics of Boron-Related Peak in IR Absorption of Natural Diamond
The decay of the transient 2800 cm–1 absorption peak in a Fancy gray diamond is observed.
HPHT-Grown Synthetic Diamond with Strain
Linear strain patterns are found in an HPHT synthetic diamond.
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