INDEX. 713 



Page. 



Gem mineral?, disperpion of li>:ht 484 



eleetri(;ity 486 



form 487 



fraetui-e 486 



har(lne>«s of 484 



hij^ter of 482 



phosjiliorci^cence 484 



pU'ochroiKm • 484 



polarization of light 484 



refraction of light 482 



specifi'! gravity 485 



stones, brilliant cut 547 



cal )ochon cnt 552 



cutting of 547 



half brilliant cut 549 



Portuguese cut 550 



rose cut 551 



star ctit 550 



step brilliant or mixed cut 552 



tabic cut 552 



trap brilliant cut 550 



trap or step cut 551 



Gems l>etter-kno\vn, Idack-colored, comparative table of the colors and distin- 

 guishing characters of the 542 



blue stones, comparative table of the colors and distin- 

 guishing characters of the 542 



brown stones, comparative table of the colors and dis-tin- 



guishing characters of the 539 



comparative tables of the colors and distinguishing char- 

 acters of the 537 



green stones, comparative table oi the colors and distin- 

 guishing characters of the 541 



having a nacreous luster, comparative talile of the colors 



and distinguishing (characters of 543 



having a play of color or irides(;ence, comparative table of 



the colors and distinguishing (characters of 543 



having chatoyant reflections, comparative table of the 



colors and tlistinguishing characters of 543 



having star-lik(> retiections, comi)arati ve table of the colors 



and distinguishing characters of 543 



limpid or colorless, comparative table of tluc colors and 



distinguishing characters of the 537 



pink stones, comparative table of the colors and distin- 

 guishing characters of the 540 



red and Hame-colored, comparative table of the colors 



and distinguishing characters of the 539 



reddish yellow or orange, comparative table of the colors 



and distinguishing characters of the 540 



violet or ainethystiiu;, comparative table of the colors and 



distinguishing characters of the 542 



yellow stones, comparative table of the colors and distin- 

 guishing characters of the 538 



bibliography of 649 



