IIDGR International Diamond Grading Institute belongs to De Beers Group. As a part of De Beers Group, which knows the secrets and science of diamonds best, De Beers IIDGR has fully benefited from the unparalleled diamond knowledge reserve of De Beers Group and is one of the few professional diamond appraisal institutions in the world. It adopts world-class color and clarity grading technology to provide certificate service for 99-cut precious diamonds patented by hot lava flame.

As the chief partner of Ailian Jewelry in China, De Beers IIDGR has inherited the authoritative diamond technology of 130 years, and is the only institution in the world that only accepts 100% natural diamonds and provides appraisal rating for them. After the most rigorous screening and appraisal procedures, the most experienced diamond appraisers provide appraisal and rating reports for each 99-cut precious diamond patented by lava flame, thus realizing the fifth confidence of Confidence beyond 4C in the industry. The diamond appraisal rating report issued by De Beers IIDGR is the guarantee of high quality of diamond products and the highest honor.