The International Institute of Diamond Grading & Research is part of the De Beers group of companies. International Institute of Diamond Grading & Research CLIENT LOG IN Select Language English Italian Chinese Taiwan Japanese SERVICES ABOUT FAQS CONTACT US THE INTERNATIONAL INSTITUTE OF DIAMOND GRADING & RESEARCH The International Institute of Diamond Grading & Research has been established by The De Beers Group of Companies, the organisation most closely associated with both the mystique and science of the world's most sought-after stone. Its mission: to provide a premium service and proprietary equipment to the industry. The International Institute of Diamond Grading & Research works only on diamonds that meet the United Nations' mandated World Diamond Council Kimberley Process. This exclusivity inspires confidence among diamantaires and, ultimately, the consumers they serve. READ MORE > EXPERTISE ACCURACY Ours is one of the only facilities of its kind solely dedicated to diamonds. Every diamond that goes through the rigour of the grading processes we offer benefits from unsurpassed technical expertise as well as the use of proprietary, industry-leading instruments. KNOWLEDGE The International Institute of Diamond Grading & Research builds on the De Beers Group's unrivalled 120-year-old knowledge of the diamond industry. We bring this heritage to bear in the grading of every diamond. EXPERTISE Our graders are passionately committed to their work; constantly researching the very latest in diamond grading technology. It is this personal touch – complemented by the International Institute of Diamond Grading & Research's advanced bespoke processes and technology – that ensures the highest levels of accuracy and consistency. READ MORE > 5C'S CARAT Every diamond's weight is measured in metric carats. The word itself is derived from the carob seeds that early diamond traders used as near-uniform counterweights to balance their scales. COLOUR Diamonds range from 'colourless' through to a whole spectrum of tints and shades. With the exception of 'fancy colours', every diamond is graded for colour along an alphabetic scale from D to Z. CLARITY Flawless diamonds are extremely rare; most have tiny inclusions inside and on occasion external blemishes as well. It is the size and positioning of these inclusions, when studied at a 10x magnification, that determine a diamond's clarity rating. CUT The art of cutting a diamond relies on precise angles, dimensions and polish to produce the best balance between size and brilliance. CONFIDENCE We believe that there is more to a diamond than its weight and appearance. To qualify for consideration by the International Institute of Diamond Grading & Research, every diamond submitted must comply with the United Nations' mandated World Diamond Council Kimberley Process. This provides diamantaires with the powerful endorsement of a 5th 'C'. It stands for 'confidence'. Read more The International Institute of Diamond Grading & Research TERMS & CONDITIONS CONTACT US DE BEERS GROUP © International Institute of Diamond Grading & Research 2012-2014. TM, DIAMONDSURETM, DIAMONDVIEWTM, and DIAMONDPLUSTM are trade marks of the De Beers Group of Companies.