How do geologists and gemologists determine the quality and value of a gemstone, and what role do the "Four Cs" (cut, color, clarity, and carat weight) play in this evaluation?

How do geologists and gemologists determine the quality and value of a gemstone, and what role do the "Four Cs" (cut, color, clarity, and carat weight) play in this evaluation?
Admin 3 days, 13 hours ago in Gemstones
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