English

Precious stones

Contents: Pearls / Frederic J. von Rapp (1913) -- Diamonds [1910s] -- Sapphires, emeralds, rubies / Frederic J. von Rapp (1914). Pearls: "Brief remarks on history, occurrences, fishing, properties, weights, values, forms, drilling, stringing, pearl collections and famous pearls."-​-​Gemology by J. Sinkankas, entry no. 5354. Sapphires, emeralds, rubies: "Historical notes, sources, some famous gems, curious lore, etc."--Gemology by J. Sinkankas, entry no. 5355.

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