This is 100% Natural, Untreated material.
 Natural Carico Lake Turquoise Cab from an Old Navajo Jewelers Collection.
This Cab was cut from a 20 Million year old PSEUDOMORPH Clam, from the High and Dry CARICO LAKE Turquoise Mine in Lander County, Nevada.  Really nice Mid Blue- Green with amber Spiderweb matrix.  A Perfect size for a Bracelet or a Large ring!

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