This deep blue stabilized Kingman Turquoise stone is set in a silver drop setting and features a really cool double band with silver drops on the bottom side. 
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Size 10.5 can be bumped up to an 11.5 if needed.
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Are you tough on jewelry? (Shhh-don't actually tell your jewler if you are 😂) Then stabilized Turquoise might be a good fit for you.  The turquoise stones are treated with a resin-like material to hold their color and polish longer, and to make them more durable over time.