: Measures internal flaws (inclusions). Fewer inclusions result in higher performance.
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: Many certified diamonds have a microscopic ID number etched on the girdle that matches their certificate. : Measures internal flaws (inclusions)
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: Graded from D (colorless) to Z. "G" or better is recommended for a white appearance.
: Demand a grading report from reputable labs like the GIA (Gemological Institute of America) or IGI (International Gemological Institute).