AGS

The most reputable laboratory in the world for Cut Quality is AGS.

AGS Laboratories use the American gem Society’s (AGS) Diamond Standards, the benchmark to which other diamonds are compared. AGS was founded in 1934 with a mission of setting and maintaining the highest possible standards of business ethics and professionalism in the jewelry industry.

http://www.agslab.com

ANCHOR CERTIFICATE

The Anchorcert gemmological office located in Hatton Garden, London, is the leading independent gemmologocal centre in the UK. AnchorCert offers a comprehensive diamond testing and grading service.

http://www.theassayofice.co.uk

EGL

The European Gemmolocial Laboratory is another institute that grades diamonds.

GIA

Established in 1931, GIA is the world’s largest nonprofit institute of gemological research and learning. Conceived 75 years ago in the grand tradition of Europe’s most respected institutes, GIA discovers (through GIA Research), imparts (through GIA Education), and applies (through the GIA Laboratory and GIA Instruments) gemological knowledge to ensure the public trust in gems and jewelry.

http://www.gia.edu

HRD

Founded in 1976, HRD Certificates has grown into one of the largest and most respected diamond grading labs worldwide. The HRD Certificate is your written assurance of quality and assurance. HRD was the first diamond grading lab in the world to be officially accredited (international Standard ISO/IEC 17025).
http://www.hrd.be

IGI

International Gemmological Institute is another institute that grades diamonds.