catalogup: of gems. 



549 



Tlio brilliiint cut i.s 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 CUT. 



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 



Fig. 10. 



THE HALF BRILLIANT. 



Top (a) and side (6) view of the lia'.f brilliant. In c the top is cut in the form of a star, then called 



English single-cut. 



of numerous facets. The figure shows top {<() and side (h) views of 

 this style of cut. Occasionally the top is cut so as to form a star {c in 

 fig. 16) and then called English single-cut. 



