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Ch. 5: Gem History Properties

Ch. 5: Gem History Properties Page of 515 Ch. 5: Gem History Properties Text size:minus plus Restore normal size   Mail page  Print this page
162                    A POPULAR TREATISE OX GEMS.
eight lozenges, with twenty-four triangles, and are called the star-facets ; the facets occupied by the collet-side are four irregular pentagons, alternating wTith as many irregular lozenges, radiating from the collet as a centre, and are bordered by sixteen triangular facets adjoin­ing the girdle, and are generally called the pavilion or cross facets. According to the number of facets, the brilliants receive their names, either of double or treble brilliant : the double brilliant is surrounded by two rows of facets on the bisel, which are triangular, and meet each other ; the treble brilliant has fifty-eight planes, fifty-six facets, table and collet, thirty-two facets of which are in the bisel in three rows ; the star aud pavilion facets are triangular, the intermediate ones are four-sided, -and on the collet-side are twenty-four facets.
The English double brilliant consists of twenty-four facets, table and collet, sixteen of which terminate in the form of a star in the bisel.
Brillionets, or half-brilliants, are those diamonds, the spread of which is too great in proportion to their depth, and the crown is only cut like a brilliant, but the collet-side is wanting.
• JB. The Hose-Diamond has a crown, but no collet ; it is formed of equilateral triangles, and consists of two rows of three-sided facets ; those on the girdle are pavilion, and the others star facets. But there are variations in the number of facets : the Dutch roses have eighteen pavilion and six star facets ; others have six pavilion ami six star facets, or twelve pavilion and six star facets; and some, also, have twenty-four three-sided pavilion and twelve, star facets. The rose-diamond is only that diamond, the., proportion of
Ch. 5: Gem History Properties Page of 515 Ch. 5: Gem History Properties
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