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| The subject of the rarity of gemstones, which so much enhances their prestige and value, leads us down into the dark, inaccessible depths of the earth's interior—to the birthplaces of the gemstones—where they were formed under the exertion of enormous natural forces. It was primarily there that the conditions critical for beauty, rarity, and durability were fulfilled; but it is strange and surprising that the majority of these most beautiful and valuable creations, conceived in the earth's womb, are composed of the most ordinary materials; namely, carbon (C), alumina (aluminium oxide, A1203), silica (silicon dioxide, Si02), lime (calcium carbonate, CaCO,), and others besides. |
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