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https://www.gemsociety.org/jewelry-lapidary/grading-gemstones-and-diamonds/
The GIA modern diamond cut grading method is the most widely accepted in the industry. Our step-by-step guide covers the tools and techniques you’ll…. Traditional Diamond Cut Grading Methods. Traditional diamond cut grading methods prepare …
https://www.firemountaingems.com/Resources/encyclobeadia/charts/E893
Grade: Hue and Color Saturation: Color Tone: Inclusions: Transparency/Opacity: Cutting, Surface, Drilling: Color is the hue expected. Color saturation is vivid and even througout the stone. Color tone is rich, but not so dark as to be near the far end of the spectrum. There are few, if any, inclusions.
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.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://www.americangemsociety.org/buying-diamonds-with-confidence/ags-diamond-grading-system/
The AGS 0–10 grading scale is easy to understand: the highest possible grade is zero, and the lowest is 10. Easy, huh? So, a diamond with a color grade of 3 has less color than a diamond with a color grade of 5. Natural diamonds having less color are rarer; therefore, they may cost more. When writing the grades of a diamond using the AGS Scale, diamond Cut grade is first, then diamond Color, Clarity, …
http://www.alphaimports.com/help/quality-score-chart.html
In terms of jewelry it denotes gold jewelry with SI2 - I1 grade diamond or color stone, plus the Sterling Silver jewelry. A :- (I2) Or Extra Value This grade denotes that the product in question is semi clean, reasonably cut and polished with noticeable variations and inconsistency in color appropriation.
https://www.halsteadbead.com/articles/types-silver-jewelry
Oct 08, 2013 · Sterling is the jewelry quality standard in the United States and most world markets. It is an alloy of 92.5% silver. The remaining 7.5% is usually copper though it is sometimes other metals such as nickel. The other metals in the alloy increase hardness so the material will be more durable.
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.
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