All AboutDiamond Certification
A diamond certificate is the independent proof behind a stone's quality, and these UK labs and jewellers grade to recognised standards. A certificate is your assurance that a diamond is exactly as described, and the specialists listed here grade, certify and verify stones so you buy with confidence.
What a Certificate Confirms
A grading report independently records a diamond's cut, colour, clarity and carat, along with measurements, proportions and any treatment. It is not a valuation, but it is the objective description that a fair price is built on, and it protects you against a stone being overstated.
Which Labs to Trust
Reports from established laboratories such as GIA carry the most weight, as their grading is consistent and widely recognised. Be cautious with in-house or unfamiliar certificates, which can grade generously. The specialists here work to recognised standards and can verify or re-certify a stone if you are unsure of its paperwork.
