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  2. A Comprehensive Guide to Buying the Perfect Diamond Jewelry - AOL

    www.aol.com/lifestyle/comprehensive-guide-buying...

    All diamonds are graded on a scale from D—colorless diamonds—to Z—diamonds with a yellow or brown tint. While a D-graded diamond is often the most in-demand, a stone that falls in the middle ...

  3. How Much Is a Diamond Worth? How To Find the Value of Your ...

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    The weight of a diamond is one of these variables that determines a diamond’s worth and is what the general public is most familiar with. The unit of measurement, called the carat, equals 200 ...

  4. Gemological Institute of America - Wikipedia

    en.wikipedia.org/wiki/Gemological_Institute_of...

    While both reports contain a number of measurements, including dimensions, proportions, carat weight, color, and clarity, the Diamond Grading Report also includes a diamond plot (a graphic representation of the position and type of inclusions present in the diamond). Diamond reports from GIA (as well as other, for-profit sources) are now ...

  5. Diamond color - Wikipedia

    en.wikipedia.org/wiki/Diamond_color

    Color grading of diamonds was performed as a step of sorting rough diamonds for sale by the London Diamond Syndicate. As the diamond trade developed, early diamond grades were introduced. Without any co-operative development, these early grading systems lacked standard nomenclature and consistency. Some early grading scales were; I, II, III; A, AA, AAA; A, B, C. Numerous terms

  6. Carat (mass) - Wikipedia

    en.wikipedia.org/wiki/Carat_(mass)

    Carob seeds have been used throughout history to measure jewelry, because it was believed that there was little variance in their mass distribution. [10] However, this was a factual inaccuracy, as their mass varies about as much as seeds of other species. [11] In the past, each country had its own carat. It was often used for weighing gold.

  7. Your Ring Could Be Worth Thousands: How To Spot Valuable ...

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  8. Sieve analysis - Wikipedia

    en.wikipedia.org/wiki/Sieve_analysis

    A sieve analysis (or gradation test) is a practice or procedure used in geology, civil engineering, [1] and chemical engineering [2] to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction ...

  9. 12 Vintage Jewelry Pieces in Your Collection That Could Be ...

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    Pieces of jewelry that are at least 50 to 100 years old and in good condition are also highly... Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290 ...