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- Facet
- Plane, polished surface of a diamond.
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- Faceted Girdle
- Sometimes cutters polish the girdle into 32 facets.
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- Feather
- A separation or break due to either cleavage or fracture, often white and feathery in appearance.
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- FL
- Flawless
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- Flaw
- An imperfection in a diamond.
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- Fracture
- A crack on the surface of the diamond.
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