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Research
Alum’s Lifelong Quest: Searching for Jewelry Unicorns
Alan Nacht continues his family’s legacy - Bernard Nacht & Co. – and his quest for unforgettable jewelry.
Kimberlites: Earth’s Diamond Delivery System
Examines the basic characteristics of kimberlites and their relationship with diamonds.
US Government to Industry: Know Your Supply Chain; De Beers, Alrosa Cut Rough Sales
State department tells industry it is not doing a good job tightening chain of custody reporting.
US Consumer Confidence Remains Strong; Alluvial Diamond Tracking and Illegal Gold
U.S. consumer confidence has kept the economy from sliding into a possible recession.
Bullish Predictions for 2019 Holiday Sales Despite Concerns, Sotheby’s Hong Kong Auction Sales
U.S. holiday sales predictions look good. Sotheby’s Hong Kong auction features GIA alumna pieces.
Why are Pink Diamonds Pink? GIA Researchers Dive Deep into their Crystal Structure
GIA researchers analyzed more than 90,000 natural pink diamonds to better understand how these rare and beautiful diamonds formed and got their color.
Natural-Color Fancy White and Fancy Black Diamonds: Where Color and Clarity Converge
A systematic study of the properties of approximately 500 Fancy white and 1,200 Fancy black diamonds.
Hydrogen-Rich Green Diamond Color-Treated by Multi-Step Processing
Characterization of an intense yellowish green faceted diamond revealed a complex treatment process.
Gemstones in the Era of the Taj Mahal and the Mughals
A look at the gem ornamentation of this landmark, as well as the jewels of the Mughal dynasty.
Diamond Market in Recovery, Top-end Auction Results
World’s two largest diamond producers say market is stabilizing after severe cutbacks in rough sales.
Gems & Gemology’s 7 Most Unusual Encounters from 2019
Check out some of the most interesting and unusual diamonds and colored stones submitted to GIA’s laboratories in 2019.
2019 in Review: Diamond Trade Begins Recovery, Jewelry Retail Blooms Late, Extraordinary Auction Sales
World’s two largest diamond producers say market is stabilizing after severe cutbacks in rough sales.
