Ch. 3: Precious Gem stones in 1887

• Ch. 1: Gold, Silver in 1887
• Ch. 2: Platinum in 1887
• Ch. 3: Gemstones in 1887

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• Louderback. Benitoite.
• Neptunite Description
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• Williams: Diamond Mines South Africa II
• Ch.17: Diamond Market
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• US Geol. Surv. 1891. Gemstones, Metals.
• Ch. 2: Gemstones in 1891
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• US Geol. Surv. 1905. Gemstones, Metals.
• Ch. 3: Gemstones in 1905
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• US Geol. Surv. 1906. Gemstones, Metals.
• Ch. 3: Gemstones in 1906
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• US Geol. Surv. 1893. Gemstones, Metals.
• Ch. 2: Gemstones in 1893
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• US Geol. Surv. 1921. Gemstones, Metals.
• Ch. 3: Gemstones in 1921
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• US Geol. Surv. 1892. Gemstones, Metals.
• US Geol. Surv. 1891. Gemstones, Metals.
• US Geol. Surv. 1907. Gemstones, Metals.

Deposits Diamond Gemological Properties Gemstones Gold History Mine Mining Production USA

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