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Oxygen isotope signatures of ruby and sapphire megacrysts, combined with trace-element analysis, from the Mbuji-Mayi kimberlite, Democratic Republic of Congo, and the Changle alkali basalt, China, provide clues to specify their origin in the deep Earth. At Mbuji-Mayi, pink sapphires have δ 18 O values in the range 4.3 to 5.4‰ (N=10) with a mean of 4.9±0.4‰, and rubies from 5.5 to 5.6‰ (N=3)...
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