|Written by Administrator|
|Wednesday, 19 September 2007|
faultless. A less-commonly-used term than flawless, but having essentially the same meaning. As a word approximately synonymous with flawless, it is subject to the same restrictions under Federal Trade Commission Trade Practice Rules. See
faulty structure. Zones of improper crystallization and internal cleavages and fractures are all considered under faulty structure. The cause may be disturbances during the growth of the crystal or later separations.
favas. A Brazilian term used to describe the grains of gem minerals found in placer deposits. Also refers to the deposits themselves.
fazenda fina. A Brazilian term that is used to describe small, slightly tinted but otherwise fine-quality diamond crystals.
feather. A feather is a cleavage or a fracture that has a feathery appearance when viewed at right angles to the separation plane. A feather that appears white to the grader is often called a glets in the trade. Hairline
feather is a cleavage or fracture that is so shallow that it appears to be a scratch at first glance, but extends a short distance into the diamond. See
CLETS, FRACTURE, CLEAVAGE.
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