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Quick answer: GIA, IGI, and HRD are the three major independent diamond-grading labs. GIA is the strictest and most trusted, IGI grades slightly more generously and dominates lab-grown certification, and HRD is a well-respected European standard. Audrey's uses all three, never self-grading a stone.
Diamond certification is an independent report from a gemological laboratory that grades a diamond's cut, colour, clarity, and carat weight, and confirms it hasn't been treated or synthetically altered without disclosure. It matters because a diamond's own seller has an incentive to overstate quality; an independent lab does not.
GIA (the Gemological Institute of America) is a non-profit research institute that created the modern 4Cs grading system still used industry-wide. It's widely considered the strictest and most consistent grading lab, which is why GIA-certified diamonds often carry a price premium over identical stones graded elsewhere.
IGI (International Gemological Institute) is a large, internationally accredited lab, particularly active in grading lab-grown diamonds. Its grading standards are generally regarded as slightly more generous than GIA's, meaning an IGI-graded stone and a GIA-graded stone at the "same" grade can look marginally different in person.
HRD (Hoge Raad voor Diamant) is the diamond grading lab of the Antwerp World Diamond Centre, widely recognised across Europe and increasingly in Asia. It applies a grading methodology broadly comparable to GIA's and is a well-respected choice for natural diamonds.
Yes. Two diamonds with identical specifications on paper can be priced differently purely because of which lab certified them, since GIA's stricter grading standard commands more trust and therefore a higher price for the same nominal grade.
Every diamond Audrey's sells, natural or lab-grown, carries an independent certificate from GIA, IGI, or HRD. Nothing is self-graded by us or by the stone's grower, and the certificate is always available before you buy.
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