Cristobalite Stars and Snowflakes in Devitrified Glass
A unique inclusion scene caused by devitrification is observed in artificial glass.
Pink Diamond with Mottled Appearance
Examination of a Fancy Deep brownish orangy pink diamond reveals evidence of treatment to enhance its color.
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.
Type IIa/IaB Diamond Showing Transient Type IIb Responses
A 2.50 ct natural type IIa/IaB diamond submitted to the Dubai laboratory shifts to type IIb after deep-UV excitation.
Ben Kho: From Rough Beginnings to Brilliant Mastery
Profiles the extraordinary life and work of Ben Kho, from a young entrepreneur in Cambodia to an award-winning gem cutter.
The Science of Phenomenal Gems, a Summary of Pegmatites, and a Cutter’s Remarkable Journey
Emeralds and Beryl from Kazakhstan and Ukraine
Imitation Seed Pearl with Blue X-Ray Fluorescence
“Sugar Plum” in Titanium-Diffused Blue Sapphire
HPHT-Processed Natural and Laboratory-Grown Diamonds with Counterfeit Inscriptions
Well-Formed Rutile Star in Quartz
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