[1874] Dieulafait, Louis - Diamonds and Precious Stones, a Popular Account of Gems

[1915] Kunz, George Frederick - Curious Lore of Precious Stones

[Gama, Jane L. N. da] - Manual Tecnico de Gemas, 4th ed. rev. (Portugese)

Behnke, Russ - Treasured Minerals

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