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I used E6000 when I made wind chimes, because it stood up well to the elements. But for jewelry, stones and minerals I use "Two Ton Epoxy" purchased at Trust Worthy Hardware. It mix equal parts, no toxic after smell and you a working time of twenty minutes.
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I have used E6000 to glue flat marbles to metal and it has withstood 100+ temperatures outside. Should do the job.
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