|Written by Administrator|
|Wednesday, 19 September 2007|
Fabulite (trademark). Trade name for man-made strontium titanate. face. (1) A term used in brillianteer-ing for the entire group of facets that can be placed on a diamond without repositioning it in the dop; viz., two star facets and four upper-break facets or four lower-break facets. (2) In crystallography, a natural, plane surface on a crystal. facet (fas"-et). A plane, polished surface placed on a diamond or other gemstone. See brilliant cut (round). faceted girdle. See girdle facet,
faceting. The operation of placing facets on a diamond or other gem. See cutting.
face up. A diamond oriented with the table facing toward the viewer, the usual position in which a mounted stone is observed. (See photo.)
face up color. Color observed in a diamond when viewed from above
in a direction perpendicular to the table. When viewed with the table up, some stones appear without noticeable color because of a masking effect caused mainly by the brilliancy of the diamond and partially by surface reflections. Color becomes visible in mounted goods, in the face up position, at about "J" or "K" color. See face up well.
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