. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. catalogup: of gems. 549 Tlio brilliiint cut cspcciiilly applied to the diiiinoMfl, and when per- fect should ])(» of the follow!ng proportions: From the table to the girdle, one-third, and from the girdle to the culet two-thirds of the total. The diameter of the table should ])e four-ninths of the breadth of the stone. When applied to other stones these proportions are more or less modified to suit their individual optical constants. DO
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. catalogup: of gems. 549 Tlio brilliiint cut cspcciiilly applied to the diiiinoMfl, and when per- fect should ])(» of the follow!ng proportions: From the table to the girdle, one-third, and from the girdle to the culet two-thirds of the total. The diameter of the table should ])e four-ninths of the breadth of the stone. When applied to other stones these proportions are more or less modified to suit their individual optical constants. DOUBLE BRILLIANT b Fig. 15. THE DOUBLE BRILLIANT. Top (a), side (6), and back (c) view. The double brilliant, or Lisbon cut, is a form with two rows of lozenge-shaped facets, and three rows of triangular-shaped facets, 74 in all. The figure shows top («), side (J), and bottom (c) views of this fashion. HALF BRILLIANT CUT. The half brilliant, single, or old English cut is the simplest form of the brilliant, and is generally employed for stones too small to admit. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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