This is a very special oval, Bisbee Turquoise, Cabochon with red webbing and quartz. This stone was cut by John Hartman from a natural Bisbee Turquoise nugget, it weighs 17.75 cts.
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Bisbee Turquoise cabochon, deep blue, Bisbee Turquoise Cabochon, red spiderweb, Bisbee Turquoise Cabochon