Still hoping to get some info - I received this ring today and it’s quite heavy. Does anyone recognize the hallmark? It’s very hard to photograph. The mark on the left side of the “R” appears to be a “c” and on the right side it looks like a “4” or triangle. Any speculation as to the stone, and is the face of the ring a tufa cast?
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That is a cool ring! 
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My guess would be Royston or Crow Springs
i would definitely say Nevada.
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