White stone ring

I bought this ring today at the same sale I got the turquoise Sunday. This stone is cracked and quite loose in the setting. The style looks Navajo to me, it’s age “old” per seller.
The ring is about 1 5/8" long X 1 " wide. The back has many scratches, no apparent hall mark…
Any ideas who and when it was made Thank you everyone.




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That “stone” may be ivory - I can see some crosshatching.

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You’ve got a good eye. It’s Ivory.

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The woman said it was “ivory” and “old.”. She didn’t say it was NA, I just thought it looked like a Navajo ring. Did NA use ivory ?

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