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SUPPLEMENT. 



The following are some of the common forms. It will be remem • 

 bered that the upper truncated pyramid is called the table, the bwer part 

 or pyramid, the collet, and the line of junction between the two parts, 

 the girdle. Figures 1 and 2 represent the brilliant, the best form of the 

 diamond, used also for other stones, as well as pastes. Figs. 3 and 4 

 are iriews of a variety of the rose diamond. Figs. 5 and 6 the same of 

 an emerald. The cut in steps is called the pavilion cut. Fig. 7 is an 

 1 2 3 



upper view of a mode of cutting the sapphire. A side view would be 

 nearly like figure 6, except that the collet is more like that of figure 8. 

 Fig. 8 represents a side view of an oriental topaz. The table.has the 

 brilliant cut, like figs. 1 and 2. Figure 9 represents a Bohemian gar- 

 net, which is made thin because its color is deep. The common topaz 

 is cut like figure 8 ; often also like figure 9 but much thicker, and fre- 

 quently having the table bordered by two or more rows of triangular 

 facets. Figure 10 is a very simple table. Figures 11 and 12 represent 

 the form " en cabochon" given the opal ; and figures 12 and 13, " en 

 cabochon" with facets, a mode, of cutting the chrysoberyl. 



