Yearning for Yellow Diamonds | GIA 4Cs Blog

If you love yellow diamonds, you’re not alone. Diamond connoisseurs spend millions on these stunning gemstones.

Prices for the finest yellow diamonds have reached breathtaking levels. A 12.16 ct Fancy Vivid yellow sold for $155,232 per carat In November 2010. A 43.36 ct Fancy Vivid yellow sold for $2,654,802.70 ($71,871 per carat) in November 2011. And a 27.42 Fancy Intense yellow sold for $76,470 per carat in December 2011...

Yearning for Yellow Diamonds | GIA 4Cs Blog

The American Gem Society (AGS)

About the American Gem Society

The American Gem Society was founded in 1934 by a small group of leading jewelers including the great grandfather of modern gemology, Robert M. Shipley. Their goal was to create an organization that could help protect the jewelry-buying public from fraud, and false advertising.

Blue Nile - Understanding the 4Cs Video

Blue Nile - Understanding the 4Cs Youtube Video

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What is Diamond Carat?

Diamond Carat Weight

Diamond carat weight is the measurement of how much a diamond weighs. A metric "carat" is defined as 200 milligrams.

What is Diamond Cut?

A Diamond's Cut Unleashes Its Light

Diamonds are renowned for their ability to transmit light and sparkle so intensely. We often think of a diamond's cut as shape (round, emerald, pear), but a diamond's cut grade is really about how well a diamond's facets interact with light.
Precise artistry and workmanship are required to fashion a stone so its proportions, symmetry, and polish deliver the magnificent return of light only possible in a diamond.

What is Diamond Clarity?

Diamond Clarity Refers to the Absence of Inclusions and Blemishes

Natural diamonds are the result of carbon exposed to tremendous heat and pressure deep in the earth. This process can result in a variety of internal characteristics called 'inclusions' and external characteristics called 'blemishes.'

What is diamond color?

Diamond Color Actually Means Lack of Color

The diamond color evaluation of most gem-quality diamonds is based on the absence of color. A chemically pure and structurally perfect diamond has no hue, like a drop of pure water, and consequently, a higher value. GIA's D-to-Z diamond color-grading system measures the degree of colorlessness by comparing a stone under controlled lighting and precise viewing conditions to masterstones stones of established color value.