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- Marquise Cut
- The name "Marquise" came from a legend of the Marquise of Pompadour that the Sun King wanted a diamond to be polished into the shape of the mouth of the Marquise. The typical Marquise Cut contains 56 facets.
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- Master Stones
- A set of color comparison diamonds that defines diamond color grades in the normal (D-to-Z) range.
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- Melee
- Small diamonds under .20 carat.
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- Mohs Scale
- The ten-point scale of mineral hardness, keyed arbitrarily to the minerals talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond.
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