The IGI Diamond ID is a diamond evaluation card that includes the same detailed information as the Diamond Report. The IGI Diamond Report give an accurate detailed of a diamond's color, carat weight, clarity, polish and carat weight according to strict international standards. Proportions are decided based on the execution of the cutter's design, rating factors such as table diameter, crown height, pavilion depth, girdle thickness, and culet size, and is assigned a grade from Excellent to Poor. Assigned a grade from Excellent to Poor, polish and symmetry are defined based on the quality of the polish and the precision of the cutting details. The stone's characteristics are available on a diamond diagram.Ī diamond's finish includes such elements as polish, symmetry, and proportions.
It is determined on a scale ranging from internally flawless to imperfect or heavily included. The amount of fluorescence is noted on a scale from None to Strong.Ī diamond's clarity is measured by an expert gemologist using a special scope and a 10x magnification loupe. The color of a diamond is based on a scale from D (colorless) to Z (yellow) by comparing it to master stones of pre-established color. IGI Diamond Grading StandardsĮach diamond is scientifically analyzed by several gemologists, who combine their experience with state-of-the-art equipment to produce a precise description of the components of the diamond and the quality of its cut.Ī diamond's carat weight and measurements are taken using carefully by calibrated instruments. The IGI's aim is to provide accurate, reliable expertise through education programs and diamond certification. About IGI Diamond CertificationĮstablished in 1975, the International Gemological Institute (IGI) is the largest independent gemological laboratory in the world, operating 18 laboratory locations. They set industry standards and are well respected. They employ leading gemologists and use the highest technologies to grade diamonds. IGI are very reliable independent diamond grading laboratory. Solitaire deals with certified/graded diamonds from the most respected lab: IGI, GIA, GCAL. Solitaire diamonds are classified IGI diamonds.
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