Ch. 3: Precious Gem stones in 1921

• Ch. 1: Gold, Silver in 1921
• Ch. 2: Platinum in 1921
• Ch. 3: Gemstones in 1921

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• Louderback. Benitoite.
• Neptunite Description
•  
• Kunz. The Curious Lore Of Precious Stones.
• Contents & Preface
•  

• US Geol. Surv. 1918. Gemstones, Metals.
• Ch. 3: Gemstones in 1918
•  
• US Geol. Surv. 1919. Gemstones, Metals.
• Ch. 3: Gemstones in 1919
•  
• US Geol. Surv. 1920. Gemstones, Metals.
• Ch. 3: Gemstones in 1920
•  
• US Geol. Surv. 1891. Gemstones, Metals.
• Ch. 2: Gemstones in 1891
•  
• US Geol. Surv. 1905. Gemstones, Metals.
• Ch. 3: Gemstones in 1905
•  

• US Geol. Surv. 1893. Gemstones, Metals.
• US Geol. Surv. 1920. Gemstones, Metals.
• US Geol. Surv. 1883-84. Gemstones, Metals.

Deposits Diamond Gemological Properties Gemstones Gold History Mine Mining Production USA

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