|Written by Administrator|
|Wednesday, 19 September 2007|
foilback. An inexpensive gemstone or a piece of faceted glass that has been backed with a thin leaf of metallic foil, either silver or other color, to simulate the brilliancy of a diamond or to impart or improve the color of a colored stone. Forlorn Hope. One of the early alluvial diamond diggings on the Vaal River, Cape Province, Republic of South africa. Now an insignificant producer.
form-and-profile diamond dressing tool. A single-diamond dressing tool for trueing special radial and step forms. It may contain either an uncut diamond crystal or a lapped diamond.
Forminiere. See l'office forestiere et
MINIERE DU CONGO.
Forty-Seventh Street. The present-day center in New York City of the diamond and jewelry industry of America.
foss. An irregular furrow or groove on a diamond crystal. Fosses are characteristic of crystals in the gray color range.
Four C's. A coined phrase for advertising purposes that restricts the numerous factors affecting diamond value to four terms: cutting, color, clarity, and carat we/grit. See quality,
FACTORS THAT DETERMINE.
four grainer. See grainer.
four-point diamond. (1) A diamond that weighs four one-hundredths of a carat. (See point). (2) A diamond whose table has been cut parallel to a possible face of the cube.
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