Loose Diamond Definitions: O

Off Center Culet - A culet that, due to differences in the angles of the opposite pavilion facets, is off center with respect to the girdle outline.

Off Make - A poorly proportioned Diamond.

Old European Cut - A term applied to the earliest form of circular-girdled full brilliant.

Old Mine Cut - An early form of brilliant cut with a nearly square girdle outline.

Opaque - A term referring to the transparency of a gemstone; opaque materials do not transmit light.

Open Table - A term that is sometimes used to refer to the table on a spread, or swindled, diamond.

Orient - The soft iridescent glow on or just below the surface of a pearl or cultured pearl.

Oval Cut - A type of fancy shape diamond, which is essentially an elongated version of a round cut.

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