CONTENTS. 477 



II. Description of iniiuM-als used as gemn — Continued. Page. 



Sodalite 527 



Spinel: 



Almandine — Balas-niby — Rubicelle — Sapphirine — Pleonast . . . 527 



Spodumene — Hiddenite — Lithia emerald 529 



Staurolite — Fairy stone 530 



Thomsonite — Lintonite 530 



Titanite— Sphene 530 



Topaz 530 



Tourmaline: 



Achroite — Aphrizite — Indicolite — Rubellite 532 



Turquoise — Callainite — Turkis 534 



Variscite — Utahite 535 



Yesuvianite — Cyprine — Idocrase 535 



Willemite 536 



Zircon — Hyacinth — Jacinth — Jargon 536 



III. Comparative tables of the colors and distinguishing characters of the 



better-known gems 537 



IV. Index of names of gems 544 



V. The cutting of gem stones 547 



Brilliant cut 547 



Double brilliant cut -■ 549 



Half brilliant cut 549 



Trap 1 )rilliant cut 550 



Portuguese cut 550 



Star cut 550 



Rose cut 551 



Trap or step cut 551 



Step brilliant or mixed cut 552 



Table cut 1 552 



Cabochon cut 552 



VI. Imitations, sophistications, and artificial formation of gems 553 



VII. Gems of the Bible 556 



VIII. Mystical properties of gems 558 



IX. Catalogue of the Isaac Lea Collection of gems 587 



A bibliography 649 



