| CHAPTER | PAGE | | I | Introductory | 1 | | II | The Origin of Precious Stones | 7 | | III | Physical Properties—(A) Crystalline Structure | 13 | | IV | ""(B) Cleavage | 19 | | V | ""(C) Light | 26 | | VI | ""(D) Colour | 32 | | VII | ""(E) Hardness | 39 | | VIII | ""(F) Specific Gravity | 45 | | IX | ""(G) Heat | 52 | | X | ""(H) Magnetic and Electric Influences | 57 | | XI | The Cutting of Precious Stones | 62 | | XII | Imitations, and Some of the Tests of Precious Stones | 70 | | XIII | Various Precious Stones | 80 | | XIV | """(continued) | 88 | | XV | """" | 98 |
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