united states evolution diamond cutting blade 305mm high sharpness

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  • Gem Stones of the United States - USGS

    2011-6-27 · standard cut for the diamond. Modifications of the brilliant form are the jubilee cut (88 facets), English brilliant (30 facets), the marquise, and the drop form. The other faceted forms are the step cut, used for emeralds and exceptionally good diamonds, and the mixed cut, a combina­ tion step cut and brilliant cut.

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