Ch. 26: Twin Colors of Doubly Refractive Stones

• Preface & Contents
• Ch. 1: Descriptions
• Ch. 2: Celebrated Stones
• Ch. 3: Superstitions
• Ch. 4: Desirable Qualities
• Ch. 5: Prices
• Ch. 6: Cutting
• Ch. 7: Weights
• Ch. 8: Artificial Coloring
• Ch. 9: Diamond
• Ch. 10: Ruby & Sapphire
• Ch. 11: Emerald
• Ch. 12: Chrysoberyl
• Ch. 13: Tourmaline
• Ch.14: Opal
• Ch.15: Turquoise
• Ch.16: Peridot, Chrysolite
• Ch.17: Matrix
• Ch.18: Trade Terms
• Ch. 19: Descriptive Terms
• Ch. 20: Digests
• Ch. 21: Seldom Used Stones
• Ch. 22: Hardness
• Ch. 23: Gravity & Hardness
• Ch. 24: Distinguish Stones
• Ch. 25: Distinct Character
• Ch. 26: Twin Colors
• Ch. 27: Gemstone Hardness
• Ch. 28: Specific Gravity
• Ch. 29: Stones & Colors
• Ch. 30: Colors & Stones
• Ch. 31: Alphabetical Order
• Ch. 32: Jewish Priest's Breastplate
• Ch. 34: Apostles Stones
• Ch. 35: Symbolic Significance
• Ch. 36: US Diamond Imports
• Ch. 37: Precious Stone Imports
• Index
• Plates

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Deposits Diamond Gemological Properties Gemstones Gold History Mine Mining Production USA

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