Research Article Search Results
Raw Brilliance: Nature’s Diamond Sculptures
Showcases the diverse natural shapes of rough diamonds and explores how geological processes create their unique forms.
External Morphology and Internal Zonal Structure of Macle Diamond
Investigates the morphological changes of macle diamonds during the growth process by exploring their three-dimensional internal zonal structure.
Extraordinary Large Bicolor Natural Rough Diamond
A 37.41 ct natural rough diamond with distinct pink and colorless zones is examined at GIA’s Botswana laboratory.
Quarterly Crystal: Unique Phantom in Diamond
A diamond octahedron contains a three-dimensional phantom visible through all eight octahedral faces.
“Sugar Plum” in Titanium-Diffused Blue Sapphire
A sugar plum–like frosted zircon cluster is observed in a blue sapphire.
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.
HPHT-Processed Natural and Laboratory-Grown Diamonds with Counterfeit Inscriptions
The Dubai laboratory reports on four diamonds inscribed with fraudulent GIA report numbers.
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.
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.
