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Impurities, flaws or defects make the diamond a rare and unique piece. No same piece is available. That is why that increases rather than decreases the value of diamonds.

The thing I find strange now is how many diamonds that 20 years ago would be considered so grossly flawed and/or impure as to be good for nothing but industrial abrasives are now considered jewelry grade. For example, 20 years ago no jeweler would facet and mount a solid black diamond! Now they call them "chocolate" diamonds and sell them at a premium!

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Q: Why do impurities or flaws increase rather than decrease the value of diamonds?
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