Famous Diamonds Examined by GIA
An aura of mystery has always surrounded these natural wonders, so it was quite an honor when GIA researchers examined these famous diamonds.
An Important Exhibition of Seven Rare Gem Diamonds
The stories behind seven strikingly beautiful rare natural diamonds, united in an exhibit at the Smithsonian, are told here.
Grading the Hope Diamond
One of the most popular exhibits at the Smithsonian Institution, the stunning Fancy Dark grayish blue Hope diamond was formally graded by GIA’s gem laboratory.
Characterization and Grading of Natural-Color Pink Diamonds
Known for their great beauty and rarity, pink diamonds have long been sought after by jewelers, collectors, and consumers.
GIA Adds On-Site Colored Stone Services in Hong Kong and Tokyo
Labs to offer expanded services beginning June 30
Gray-To-Blue-To-Violet Hydrogen-Rich Diamonds from the Argyle Mine, Australia
The Argyle diamond mine is the only known source of type IaB hydrogen- and nitrogen-rich diamonds colored gray to blue to violet.
Natural-Color Green Diamonds: A Beautiful Conundrum
Characterizes diamonds with exceptionally rare natural green color, based on GIA’s extensive database of samples.
Colored Diamonds: A Colorful Anniversary
The GIA Colored Grading Diamond System is the method by which colored diamonds are graded. It’s been so successful, that GIA has been entrusted with grading virtually every important colored diamond that has gone to auction.
Saltwater Pearls from the Pre- to Early Columbian Era: A Gemological and Radiocarbon Dating Study
Examines 85 saltwater natural pearls, reportedly harvested from the Caribbean islands off the coast of Venezuela during the early 16th century, to determine their age.