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https://www.gemsociety.org/jewelry-lapidary/grading-gemstones-and-diamonds/
Carats are the units used to measure gem weight and one of the main factors in gem grading. Learn what affects the price per carat of various gem species.… Blue Tourmaline (Indicolite) Buying Guide Our indicolite buying guide can help you learn …
https://www.firemountaingems.com/Resources/encyclobeadia/charts/E893
There are other factors taken into consideration when grading colored gemstones such as the quality and rarity of the material, enhancements, overall size of the stone, uniformity of shape, quality of cutting/faceting and the combination of graded features. How did you like this resource?
https://www.gemsociety.org/article/a-consumers-guide-to-gem-grading/
The top three grades that indicate colorlessness for diamonds (D to F) vary subtly only by differences in transparency. The next four grades cover “nearly colorless” (G to J), which means diamonds with these grades will appear colorless when set in jewelry. It takes an expert in a laboratory setting to distinguish between grades G to J.
https://www.americangemsociety.org/buying-diamonds-with-confidence/ags-diamond-grading-system/
When writing the grades of a diamond using the AGS Scale, diamond Cut grade is first, then diamond Color, Clarity, then Carat Weight—in that order. If a diamond possessing the finest diamond Cut grade is also colorless, free of inclusions and blemishes, and weighs one carat, it …
https://ezinearticles.com/?Jewelry-Reviews---What-Are-the-Grades-of-Silver?&id=4602790
There are actually different grades of silver which, in large part, is used to determine its worth. Although there are variants, the main grades of silver are pure, sterling, and parts. Pure silver is 99.5% silver or above; or 995-1000 parts out of 1000 of silver. It is typically only the component of fine silver jewelry.
https://blog.goldiesjewelry.com/understanding-gold-grades-and-other-precious-metals/
Sep 03, 2019 · Unlike diamond grades, gold grading is not done to measure weight. Instead, gold grading systems are used to measure the amount of pure gold that is present in each piece. Essentially, the ratings tell retailers and consumers how “pure” the gold is in jewelry items. Gold Purity. You’ve likely noticed various embossed codes on your jewelry ...Estimated Reading Time: 3 mins
https://jadeites.wordpress.com/grades-of-jade/
Actually, when one says the words “fake jade” he is classifying himself as an amateur. Jade does not differentiate real vs. fake; it classifies Jade as A, B, C or B+C grade. A Grade: Unprocessed, unaltered 100% natural Feicui. Natural jade that has only been polished in wax and undergone a heat treatment is known as A grade.
https://en.wikipedia.org/wiki/Coin_grade
A "grade" measures a coin's appearance. There are generally five main components which determine a coin's grade: strike, surface preservation, luster, coloration and eye appeal. Grading is subjective and even experts can disagree about the grade of a given coin.
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