See Gem As
Tools
Research
New Edition of Tillander’s Diamond Cuts in Historic Jewellery 1381–1910
An updated edition of Herbert Tillander’s book is now available.
Fracture-Filled Diamonds Detected in Mounted Jewelry
The Mumbai laboratory reports on a jewelry submission containing fracture-filled diamonds.
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.
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.
Diamond Ring Prize from an Arcade-Style Claw Game
A diamond ring from a claw game in Japan is analyzed.
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.
Quarterly Crystal: Almandine-Pyrope Garnet in Diamond
A diamond octahedron from South Africa hosts a rare yellow-orange almandine-pyrope garnet crystal.
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.
HPHT-Processed Natural and Laboratory-Grown Diamonds with Counterfeit Inscriptions
Quarterly Crystal: Unique Phantom in Diamond
