ペトラの42カラットの青いダイヤモンドが天然宝石への期待を高める
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MINING.com - Diamond2026-01-19
Africa-focused Petra Diamonds (LON: PDL) has unearthed an ultra-rare blue diamond weighing just under 42 carats at its Cullinan Mine in South Africa, a discovery that could sell for as much as $40 million and is already being described as o...
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