[Answer] Which is NOT one of the "Four Cs" of gemstone grading?

Step 1 : Introduction to the question "Which is NOT one of the "Four Cs" of gemstone grading?"

...All gemstones, including diamonds, are evaluated by gemologists using the Four Cs method, which grades the stones based on color, cut, clarity, and carat. “Color” refers to the stone’s hue, tone, and saturation, while “cut” is the shape that it has been cut and polished into, which is judged by technique. “Carat weight” is the unit of measurement of gemstones, and “clarity” depends on the type of gemstone, but some are highly valued for their clarity. Any stone that is cut and polished can be classified as a gemstone. Gemstones come from natural sources, especially minerals and rocks, but also from other organic substances, like pearls and amber.

Step 2 : Answer to the question "Which is NOT one of the "Four Cs" of gemstone grading?"

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