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Tools
Research
Special Jewelry Collection Showcases Innovative Designs, Techniques
The GIA Museum showcases contemporary jewelry pieces donated by the American Jewelry Design Council.
Near-Colorless Melee-Sized HPHT Synthetic Diamonds Identified in GIA Laboratory
The Bangkok lab examines near-colorless HPHT synthetic diamonds in melee sizes.
LPHT-Annealed Pink CVD Synthetic Diamonds
The New York lab examines three pink CVD synthetic diamonds which have received LPHT annealing treatment.
Diamond Slices
The popularity of gem slices, particularly diamond, is on the rise, as reflected at the 2015 Tucson gem shows.
De Beers Reduces RoughPrices – Too Little?
De Beers reduces rough prices at May sight, undisclosed treated diamonds submitted to GIA and Sotheby’s, Christie’s sales break auction records − again.
U.S. Retail Sales Remain Cautious
Caution continues so far in 2015. The numbers for jewelry retail sales, De Beer sights and Sotheby’s and Christie’s auction sales tell the story.
Jeweled Butterflies Welcome Spring
Screening of Small Yellow Diamond Melee for Treatment and Synthetics
Melee diamonds can be efficiently screened for synthesis and treatment using infrared absorption spectroscopy, DiamondView imaging, and microscopy.
Very Large Irradiated Yellow Diamond
A very large diamond with a Fancy Vivid yellow color was identified as artificially irradiated.
Mixed-Type HPHT Synthetic Diamond with Unusual Growth Features
Although this stone bore some superficial resemblance to moissanite, its gemological properties were consistent with HPHT synthetic diamond.
Diamond Cut: Anatomy of a Round Brilliant
Jewelers and gemologists use a specific set of terms to describe parts of a polished diamond. Certain measurements of the shape or proportions ultimately have an affect on the round brilliant diamond’s cut grade.
