Frequently asked questions

Why does GIA provide fewer grade categories for colour and clarity for laboratory-grown diamonds?


GIA has always used different terminology to report the colour and clarity grades for laboratory-grown diamonds. GIA’s Laboratory-Grown Diamond Report, which replaced the GIA Synthetic Diamond Report in July 2019, uses Colourless, Near Colourless, Faint, Very Light and Light to report the colour grades for laboratory-grown diamonds rather than the D-to-Z scale used to report the colour grades for natural diamonds, and uses Flawless, Internally Flawless, Very Very Slightly Included, Very Slightly Included, Slightly Included and Included to report the clarity grades for laboratory-grown diamonds.

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