My! Thank you for your vote of confidence, Jerin. I'm not so sure that I'm an expert although I have spent a good deal of time trying to educate myself on the subject. I feel that I have a "good working knowledge" of the subject. I just took my caliphers and checked to see what .15mm looks like. It's pretty thin! Part of the answer is going to have to do with the resiliancy of the resin fill that they use in their Mabe's. I've read Eyris' account of their process on their website and it seems they use a "clear" plastic resin, but I don't think they say just how hard it is. If it is very soft or compressible at all then that would worry me. I don't think that abalone that thin, tough as NASA says it is, will take much in the way of flexing. I'm thinking that they (Eyris) probably know that, though. The other concern would be wear. Nacre is not very hard and it can be worn away by abrasion and is also is subject to chemical erosion, over time, from even rather low grade acids that are often very common in our everyday environment. It is my opinion that it is probably an item that should not be worn in a ring or perhaps even in constant, everyday use. There's just not very much "
there, there."
Thinking further: I think that I might give it the same consideration that I would an opal.
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J Marcus
http://www.flyrodjewelry.com/home.html