Pietre preziose

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Pietre preziose di corallo nero
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Pietre preziose di rame nero
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Pietre preziose a fascia nera
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Pietre preziose di agata nera
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Pietre preziose di perle Biwa
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Bismutotantalite Gemstones
Bismutotantalite Gemstone Introduction Bismutotantalite is a rare and captivating gemstone known for its unique properties and striking appearance. It belongs to the tantalite group and is primarily composed of bismuth, tantalum, and oxygen. This gemstone is highly valued for its aesthetic appeal and metaphysical properties. Physical Properties ·         Color: Bismutotantalite typically exhibits hues ranging from dark brown to black with a metallic luster . ·         Hardness: It has a hardness of 6 to 7 on the Mohs scale, making it suitable for jewelry but requiring careful handling . ·         Luster:... 続きを読む
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Pietre preziose di cristallo di bismuto
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