Please ensure Javascript is enabled for purposes of website accessibility.
Search
Search
Search

GIA 4Cs Diamond Blog

GIA 4Cs Diamond Blog

The Pink Star ring, which sold at a Sotheby’s auction for $71 million, contains a 59.60 ct Fancy Vivid pink diamond graded by GIA.
Crazy for Colored Diamonds

Jewelry connoisseurs have gone crazy for colored diamonds. And their appetites were practically insatiable in 2013.

(more…)
Queen Elizabeth Koh-i-noor
Famous Diamonds: The Koh-I-Noor

Of all the diamonds in our Famous Diamonds series, the Koh-i-noor has one of the most mysterious pasts. It is likely from the Golconda region of India, although it is not known exactly when it was found, resulting in centuries of debate about its early history.

(more…)
coated collections of colored diamonds
Diamond Treatments and What They Mean to You

As a diamond consumer, you’ve probably heard the term “diamond treatment” or “treated diamond,” or perhaps “enhanced diamond” and wondered what that meant. A relatively small percentage of gem-quality diamonds are treated and they are treated for two reasons: to improve clarity or to alter color.

(more…)
The Culllinan II, a 317.4-carat rectangular cushion cut, is set into the Imperial State Crown. - Courtesy Time & LIFE Pictures/Getty Images
Famous Diamonds: Cullinan II

The Cullinan II is a 317.40 carat (ct) cushion cut diamond and the centerpiece of the British Imperial State Crown. Do you know the history behind this beautiful diamond? (more…)

Diamond Blemishes Defined

Last week, we talked about internal characteristics, or inclusions, and identified some of the most commonly seen ones. Today, we take a closer look at external characteristics, or blemishes, which are confined to the surface of a diamond. (more…)

Diamond Inclusions Defined

Because diamonds form under tremendous heat and pressure, nearly every one possesses internal and external features called clarity characteristics. These characteristics help gemologists separate natural diamonds from synthetics and simulants, as well as identify individual gems. (more…)

The Timeless Intrigue of Colored Diamonds

As the creator of the 4Cs and International Diamond Grading System, GIA also established color grading standards and terminology specifically for colored diamonds, based on the color’s hue, tone, and saturation. Today, we identify some of the defining characteristics that help make fancy-color diamonds a true feast for the eyes. (more…)

GIA diamond 4Cs Spokes
Tips for Online Diamond Buying

Consumers have more options than ever when it comes to buying diamonds. In addition to jewelry retailers, you can shop conveniently from your computer, tablet, or smartphone. Many of the same considerations apply whether you’re buying a diamond in person or online, but GIA has a few additional tips for shopping online that will help you click the “Buy Now” button with confidence. (more…)

4Cs Q&A with GIA: Diamond Cut Grading

Next up in GIA’s 4Cs Q&A series is diamond cut grading. (more…)

jennifer aniston
Vintage Diamond Cuts

As seen during the 2013 Oscars, vintage jewelry and diamonds continue to live in the spotlight, as evidenced by this 19th century oval and cushion cut diamond bracelet worn by Jennifer Aniston. But do you know the storied history behind your favorite vintage diamond cuts? (more…)

Diamond Green-Yellow_404
Caring Tips and Fun Facts for April’s Birthstone: Diamond

April babies are lucky enough to have the most celebrated gemstone on Earth for a birthstone. So brilliant they were once thought to be fallen stars, diamonds are considered the hardest natural substance. (more…)

GIA Diamond Grading Scales: The Universal Measure of Quality

The prospect of purchasing a diamond may seem daunting, but through GIA, an unbiased authority on diamonds, you have several handy resources to help you select the highest quality diamond. First up, an overview of the 4Cs: Color, Clarity, Cut, and Carat Weight. (more…)