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Gemological Institute of America grading system History. In 1952, Richard T. Liddicoat, along with Marquis Person, Joe Phillips, Robert Crowningshield and Bert Krashes began to work on a new diamond grading system which they called the "diamond grading and evaluation appraisal". The GIA Cut Grading System allows the public and the diamond industry to use cut along with colour, clarity and carat weight when assessing or purchasing a round brilliant diamond. AnchorCert ® Clarity Grading Scale.

At this point, the grading results can be accessed electronically by the client through our online account management system. Diamonds are a relatively common gemstone as gemstones go, and this grading system was essentially introduced to increase the ‘appearance of rarity’. Don’t just take my word for it. Richard Wise, one of the world’s foremost gem connoisseurs, in his book Secrets of the Gem Trade , calls the clarity grading of a Diamond ‘an absurdly stringent standard of judgement’. http://gia.edu/diamondHow to Choose a Diamond: Four-Minute GIA Diamond Grading Guide by GIA. This informative four-minute video will help you choose a diamon IGI screens every diamond using state of the art technologies to determine naturally mined, laboratory grown or simulant origin.

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GIA is known for creating the common grading system known as the 4 C's, which include cut, color, clarity, and carat. The system created a universal language The process of grading white diamonds in this way was developed by the Gemological Institute of America (GIA), and it is now considered a standard The Colour grade scale goes from D - Z, with D colour stones being completely colourle The prospect of purchasing a diamond may seem daunting, but through GIA, an unbiased authority on diamonds, you have several handy resources to help you select the highest quality diamond. First up, an overview of the 4Cs: Color, Clarity, Cut, and Carat Weight. The AGS 0–10 Diamond Grading System The AGS 0–10 grading scale is easy to understand: the highest possible grade is zero, and the lowest is 10.

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We offers accurate grading to the GIA Certified Diamonds which results in correct & exact value of Diamonds.

Every diamond is unique. None is absolutely perfect under 10x magnificatio To be certain that you have the diamonds you paid for, you need a grading report .
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Sink. Ductility. av B Åkerud · 1995 — Alarm system el installation Aggregate grading, particle size distribution, Grain Rumskomplettering.
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Diamond grading is a complex process, part science and part art. The contemporary diamond grading system is a standardized, global way for jewelers, laboratories, and consumers to establish the characteristics of a given diamond. But how was this system developed?

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The colours that may decrease the value or rarity of a diamond range from In the 1940s and '50s, GIA developed the 4Cs and the GIA International Diamond Grading System™ to objectively compare and evaluate diamonds.

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Diamond Grading. Carat. Diamond weight is measured using the metric carat system whereby 1 metric carat (1 ct.) = 0.2 gram. Each carat is divided into 100 points. For example, a 30-point diamond weighs 0.30 carats.

The AGS laboratory is renowned for its scientific approach and research in diamond cut grading.