Types
Color, Clarity, Cut and Carat Weight are collectively called the 4Cs of diamond quality. Color measures a diamond’s absence of color. Clarity considers a diamond’s inclusions and blemishes and how they affect its appearance. Cut describes the diamonds fire, brilliance and proportions. Carat weight is the measurement of how much a diamond weighs in metric carats.
Read MoreThe color grade of most gem-quality diamonds is based on the absence of color.
Read MoreThe carat, the standard unit of weight for diamonds and other gemstones, takes its name from the carob seed.
Read MoreWe often think of a diamond's cut as shape, but a diamond's cut grade is really about how well a diamond's facets interact with light.
Read MoreDiamond clarity refers to the absence of inclusions and blemishes.
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Article
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.
Read MoreInteractive diamond tool for consumers, retailers
Read MoreInstitute expands accessibility for diamond tool
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Article
GIA began issuing reports that included a cut grade for round brilliant diamonds in 2006 in an effort to establish standards for cut in the same manner as it has for color and clarity. This grading system is based on research conducted over the prior decade which was chronicled in several articles published in Gems & Gemology.
Read MoreThis seminar will introduce the knowledge essential for both gem and jewelry professionals and collectors. Key topics will include diamond’s physical properties, diamond formation, major sources, the 4Cs of Diamond Quality, clarity and color treatments, laboratory-grown diamonds and simulants, the mine-to-market journey, and GIA’s diamond services.
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