When purchasing a diamond — above all for something as significant as an engagement ring — you deserve complete confidence in the quality and authenticity of your stone. That is what a diamond certificate provides.
A diamond certificate, also called a grading report, is an official document giving a detailed, independent assessment of a diamond's quality and characteristics. Here is why it matters, and how to read one.
What is a diamond certificate?
A certificate is issued by an independent, accredited gemological laboratory after an expert gemologist has examined the stone. It records a full analysis of the diamond's 4Cs — carat weight, cut, colour and clarity — alongside the other details that shape its value.
Why is a certificate important?
Verification of quality: the certificate confirms that the diamond you receive matches its description.
Authenticity: it attests to the exact nature of the stone and its characteristics, evaluated by an unbiased third party.
Value: the detailed grading underpins a fair assessment of the diamond's worth.
Peace of mind: an expert's grading lets you purchase with complete confidence.
What a certificate contains
Carat weight: the diamond's exact weight.
Cut grade: the quality of the cut, which governs brilliance and sparkle.
Colour grade: typically on the D (colourless) to Z (light yellow or brown) scale.
Clarity grade: from Flawless (nothing visible under 10x magnification) to Included (inclusions visible to the naked eye).
Measurements: the stone's length, width and depth.
Proportions and angles: the geometry that shapes its light performance.
Polish and symmetry: the quality of the surface finish and facet alignment.
Fluorescence: whether the diamond fluoresces under UV light, which can affect its appearance.
Additional details: many certificates include a plot of the stone, marking the position of any inclusions or blemishes.
Trusted gemological laboratories
Gemological Institute of America (GIA): renowned for stringent standards, widely regarded as the industry benchmark.
International Gemological Institute (IGI): thorough reports, and the leading name for grading lab-grown diamonds.
HRD Antwerp: a leading European laboratory known for precise, reliable grading.
Which of our stones come with a certificate?
We believe in full transparency. Every Le Diamève laboratory-grown diamond of 0.50 ct and above comes with a detailed certificate from a reputable gemological laboratory — so you know exactly what you are getting: a beautiful, high-quality laboratory-grown diamond with verified characteristics. Stones below 0.50 ct come with a card listing the laboratory-grown diamonds set in your ring.
