|loupe louped lower-break facets lozenge facet|
|Written by Administrator|
|Friday, 21 September 2007|
loupe (loop). Any small magnifying glass mounted for use in the hand as a hand loupe, or so that it can be held in the eye socket or attached to spectacles as an eye loupe. A loupe may contain a single lens (uncorrected) or a system of lenses (corrected), which in commercial usage range from 2 to 20 power or more. The usual jeweler's or watchmaker's loupe is uncorrected and magnifies from 2 to 3 times; aplanatic loupes (those that are corrected for spherical aberration) vary from 6 to 20 power. In order to pronounce a diamond flawless by the American Gem Society definition or perfect by Federal Trade Commission Trade Practice Rules, the minimum specifications for a magnifier call for a 10x loupe corrected for spherical and chromatic aberration. See aberration.
louped. A trade term meaning that a diamond or other gemstone has been examined and probably graded by using a loupe.
low cape. See cape.
lower-break facets. See girdle facets
lower-girdle facets. See girdle facets
lozenge cut (loz"-enj). A four-sided form of cutting, usually step cut, resembling a playing-card diamond in outline.
lozenge facet. A term sometimes used synonymously with the four quoin facets (bezel or top-corner facets) on the crown of a brilliant-cut diamond. Some cutters use the term for the four pavilion-main facets or bottom-corner facets. See quoin facet, bezel facet, pavilion facet
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