Recutting Diamonds and colored stones

The professional gemologist course says when recutting a stone you have the customer sign a potential damage waiver due to the stone possibly having “hidden weaknesses”. My question is what are the potential hidden weaknesses?

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After you cut and facet a few stones you will have greater understanding. Internal Strain; Cleavage Planes; Susceptibility to temperature changes and vibration (sometimes ultrasonic) on the saw and polishing wheel, but not limited to.

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Thank you