A Fascinating Large South Sea Bead Cultured Pearl
An exceptionally large South Sea bead cultured pearl is examined at GIA’s Mumbai laboratory.
CVD Diamond Over 34 Carats
A look at a 34.59 ct CVD-grown diamond examined at GIA’s Hong Kong laboratory.
Yellow Zoning in Pink Diamonds
Unusual natural pink diamonds displaying faint yellow color zoning and strong yellow fluorescence are studied in the Carlsbad laboratory.
Fine Linear Structures in Non-Bead Cultured Pearls
Analysis of internal structures in non-bead cultured pearls submitted to GIA’s Mumbai laboratory.
Natural Diamond with CVD-Like Fluorescence Pattern
Examination of a natural diamond reveals graining and zoning that resemble those of a laboratory-grown CVD diamond.
CVD Diamonds with Invisible Markings
A new type of invisible marking in CVD diamonds suggests a possible security measure.
Glass Imitation of Cat’s-Eye Chrysoberyl
A brownish yellow cabochon submitted as cat’s-eye chrysoberyl is identified as artificial glass.
Pink Zektzerite
A rare example of faceted gem-quality zektzerite is examined in GIA’s Carlsbad laboratory.
Plastic Imitations of Emerald
Two items submitted as emerald to the New York lab are identified as plastic manufactured products.
Two Pearls of Indian Cultural Significance
Two pearls representing Indian deities were recently examined in the Mumbai laboratory.