The value will depend upon the kind of mother of pearl, the size, and the processing done on the piece. To determine a rough estimate, I found a source offering a plain 31 mm Polished Black Mother of Pearl disk (no top hole) for $2.00. The area would be pi*r*r = pi*15.5*15.5 = 755 square millimiters = 7.55 square centimeters. The cost per centimeter would then be $2.00/7.55 = approximately 26 cents per square centimeter.
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