Is it the same with jewels? or are they more ambiguous?
IMO, jewels are indeed much more ambiguous. Many sororities have the same jewel(s), so even if you were all decked out in one particular jewel (which I don't necessarily recommend) I don't think it would be seen as being presumptuous of fitting in or getting a bid with a particular sorority.
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Autism Speaks & Alpha Xi Delta -Sharing the Love