Research Article Search Results
Pezzottaite with Multiple Cat’s-Eyes
The Tokyo laboratory examined a purplish pink pezzottaite cabochon displaying multiple cat’s-eyes.
Lithiophilite in Quartz
A well-formed lithiophilite crystal is identified in colorless quartz.
Imitation Seed Pearl with Blue X-Ray Fluorescence
X-ray fluorescence screening is used to identify an imitation in a submission of more than 9,000 seed pearls.
Iridescent Gems Cut from Hinge Ligament of South Sea Pearl Oyster (Pinctada maxima)
Biogenic material from a pearl oyster is used to produce a new eye-catching blue-green iridescent gem material.
Three Large Natural Hollow Pinctada radiata Pearls
Three large natural pearls with hollow interiors reportedly from Bahrain are studied in the Mumbai laboratory.
Exceptional Nacre Thickness of Hybrid Akoya Bead Cultured Pearls
GIA’s Bangkok laboratory reports on a hybrid mollusk species that can produce bead cultured pearls with a thicker nacre layer.
HPHT-Processed Natural and Laboratory-Grown Diamonds with Counterfeit Inscriptions
The Dubai laboratory reports on four diamonds inscribed with fraudulent GIA report numbers.
GIA 7 Pearl Value Factors: An Update on Nacre Classification
A new nacre scale is established in the GIA 7 Pearl Value Factors classification system.
“Goose Bumps” on South Sea Pearl
Pinpoints densely cover the surface of a golden South Sea pearl.
CVD-Grown Diamond with Unusual Cause of Greenish Color
A previously unidentified cause of green color in CVD-grown diamonds is detected for the first time in a diamond submitted to the Carlsbad laboratory.
Unique Trapiche Grossular from China
Grossular crystals cut along specific orientations reveal a distinct trapiche structure.
Unusual Patterns in Diamonds Composed of Dark Micro-Inclusions
Two natural diamonds exhibiting dark micro-inclusions are compared in the Carlsbad laboratory.
