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https://www.gemsociety.org/jewelry-lapidary/grading-gemstones-and-diamonds/
Carats and Gemstone Grading 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
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 …
https://www.firemountaingems.com/resources/jewelry-making-articles/e40a
Although there are A grades of gemstone beads, the largest and best-quality gemstones are generally used for faceted gems in the high-end jewelry industry. Bead cutters will "high-grade" the rough and use the better materials to cut the A grades, and according to the stone variety separate into the B and C grades, and so on. 2.
https://ezinearticles.com/?Jewelry-Reviews---What-Are-the-Grades-of-Silver?&id=4602790
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. Although more valuable, it is not a very pragmatic choice as it is very soft in its pure form.
https://jadeites.wordpress.com/grades-of-jade/
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. B Grade: Has undergone a bleaching process to clean the inside of impurities and inferior color.
https://www.titaniumstyle.com/ti-grades.htm
We use 3 grades of titanium to manufacture our jewelry. Titanium rings are available in Aircraft grade titanium Ti-64, super hard titanium Ti-662, and pure titanium Ti-999. Ti-6/4 - Aircraft grade titanium alloy (6Al/4V) Ti-6/6/2 - Extra-hard titanium (6Al/6V/2Sn)
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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