A sapphire from sediment in the Kyll, a river in the western Eifel. The crystal measures approximately 0.9 mm in diameter. Sapphires are among the most precious gems, yet they consist solely of ...
Scientists have uncovered the origins of sapphires, revealing that these stunning blue gemstones form deep within the Earth's crust through volcanic activity. Research led by geologist Axel Schmitt ...
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