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The four C’s
Determining the value of a gemstone involves what gemologist refer to as the “four C’s.” They are as follows: 
  1. Color
  2. Clarity
  3. Cut
  4. Carat Weight
Clarity

Clarity is judged by reference to inclusions. Magnification can be used to locate inclusions, but with the exception of inclusions which might impact durability, only those visible to the naked eye should influence the final grade. In this way, colored gems are very different from diamond. Indeed, in certain cases (Kashmir sapphires being a classic example), the inclusions can actually enhance beauty and value.

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