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Everything you need to know

Until the middle of the twentieth century, there was no agreed-upon standard by which diamonds could be judged. GIA created the first, and now globally accepted standard for describing diamonds: Color, Clarity, Cut, and Carat Weight. Today, the 4C's of Diamond Quality is the universal method for assessing the quality of any diamond, anywhere in the world.

The creation of the Diamond 4C's meant two very important things: diamond quality could be communicated in a universal language, and diamond customers could now know exactly what they were about to purchase.


A Diamond's Shape is the outline of a diamond as seen from above.

People often confuse a diamond’s shape with its cut, when in fact both of them are two separate aspects of a diamond. Here are some of the most popular shapes of diamonds, choose the one that best suits your style and needs.

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The diamond color of most 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.

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Diamond clarity refers to the absence of inclusions and blemishes.

Evaluating diamond clarity involves determining the number, size, relief, nature, and position of inclusions (internal) and blemishes (external), as well as how these affect the overall appearance of the stone. While no diamond is perfectly pure, the closer it comes, the higher its value. The GIA Diamond Clarity Scale has 6 categories, some of which are divided, for a total of 11 specific grades. Many inclusions and blemishes are too tiny to be seen by anyone other than a trained diamond grader.

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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.

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An enduring element found naturally in a distinct yellow color.

A metric “carat” is defined as 200 milligrams. Each carat can be subdivided into 100 ‘points.’ This allows very precise measurements to the hundredth decimal place. A jeweler may describe the weight of a diamond below one carat by its ‘points’ alone. For instance, the jeweler may refer to a diamond that weighs 0.25 carats as a ‘twenty-five pointer.’ Diamond weights greater than one carat are expressed in carats and decimals. A 1.08 carat stone would be described as ‘one point oh eight carats.

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