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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.

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Rough CLIPPIR diamonds
The Very Deep Origin of the World’s Biggest Diamonds

Explores an exceptional family of diamonds, referred to as “CLIPPIR” (Cullinan-like, Large, Inclusion-Poor, Pure, Irregular, and Resorbed), that formed in a superdeep environment.

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Article
The Magic of Colored Diamonds

Colored diamonds are in the spotlight. They’re routinely breaking records at auction houses. Learn more about these gemological marvels of the rarest order.

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Drilled natural pearls examined in this study.
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.

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5.19 ct CVD synthetic diamond
CVD Synthetic Diamond Over 5 Carats Identified by GIA

Results from GIA’s recent testing of a 5.19 ct CVD synthetic diamond, the largest it has examined to date.

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10.08 ct HPHT synthetic diamond with color equivalent to Fancy Deep blue
Blue HPHT Synthetic Diamond Over 10 Carats

Results from GIA’s recent testing of a 10.08 ct blue HPHT synthetic diamond, the largest HPHT synthetic recorded to date.

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A diagram uses four rulers to show how color, clarity, cut and carat weight are measured.
Article
Diamond Quality: A Short History of the 4Cs

You’ve heard about the 4Cs of diamond quality (color, clarity, cut, carat weight). But how did they become so well-known? Here’s a little diamond history.

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Article
Is Another 1,000 (or 3,000) Carat Diamond Around the Corner?

Find out why the number of very large diamonds entering the market has increased sharply in the last few years.

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Couple Engagement Ring Shopping
Article
How to Purchase the Perfect Diamond Engagement Ring

Follow these tips to pick out the perfect engagement ring for the love of your life.

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The 14.62 ct. emerald cut Fancy Vivid Blue Oppenheimer diamond is flanked by diamonds in a ring setting.
Article
Spring 2016 Auction Update: Big Checks – Mega Diamonds

Big diamonds – really big ones – dominated the news in May, setting sales records for colorless and colored beauties.

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