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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.
Slow Diamond Market Puts Miners Under Pressure
Soft conditions in the world diamond industry are making their way into miners’ bottom line. Plus, market reports on China and Japan.
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
A Larger, Higher-Quality NPD Synthetic Diamond
GIA’s New York laboratory recently detected an undisclosed NPD synthetic diamond, a 1.51 ct Fancy Black round.
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.
