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© 2002 - 2016 Gemological Institute of America inc. Many people ask why the GIA diamond grading scale starts at D. Arcane systems used grades of A-C, 1-3, and I-III, etc. It holds true for all other shape diamonds except that SI2 clarity may have visible inclusions for some of the princess, fancy shape diamonds. Sometimes as a crystal grows it can develop irregularities in its atomic structure.Natural diamonds are the result of carbon exposed to tremendous heat and pressure deep in the earth. Learn more about buying a diamond with … You will find a huge choice available – something to suit every budget. In the 4Cs, the third most important factor when evaluating your stone is clarity. Diamonds that range from colourless to light yellow and brown fall within the normal colour range. The 4Cs means two very important things: diamond quality can be communicated in a universal language, and diamond-buying consumers can know exactly what they are about to purchase.Use of this site signifies your agreement to its terms of use. Purchasing a diamond with an AnchorCert report means that your diamond has been thoroughly scrutinised by a team of independent gemmologists and graded to GIA master stones and nomenclature. Toni Croft // April 18, 2020 at 7:47 am // Reply. Within that range, colourless diamonds are the most rare, so they’re the most valuable.  Most people think that diamonds are colourless, but in fact most diamonds used in jewellery have slight tints of yellow or brown. GIA 4Cs APP. Clarity Scale. Diamond clarity spans 6 categories with a total of 11 clarity grades In 1953, Richard T. Liddicoat and colleagues established the Gemmological Institute of America (GIA) diamond grading system and clarity scale. Many inclusions and blemishes are too tiny to be seen by anyone other than a trained diamond grader. Each clarity grade represents a range so two diamonds with the same clarity grade may have different inclusions. The factors that influence the value are the quality of the diamond – the clarity, colour, cut and of course, its size.Most people think that diamonds are colourless, but in fact most diamonds used in jewellery have slight tints of yellow or brown. Almost all diamonds are graded for clarity using the 11 point diamond clarity scale created by the GIA, including diamonds which were not actually graded by GIA (every Lumera Diamond is GIA certified).In grading diamond clarity, the GIA considers the number, size, color, reflectivity, and position of every flaw visible under 10x magnification. AnchorCert Gem Lab Diamond Reports add value to a diamond by providing an accurate and unbiased testament to its quality. A deep cut diamond means that the light escapes from the bottom causing the diamond to appear dull and lifeless.Diamonds were formed at the beginning of time,when a combination of heat and pressure deep beneath the earth’s crust miraculously transformed carbon into diamond – the hardest substance found in nature.