How to repair opal..?

Can anyone tell my how to repair an opal ring. I am aware (now) that the stone is very fragile, but what happens if the stone has been chipped? I have a large opal ring with quite a big chip in the middle and a thin crack. Is there any way of filling the crack with gel or buffing the stone to get rid of the crack?... show more Can anyone tell my how to repair an opal ring. I am aware (now) that the stone is very fragile, but what happens if the stone has been chipped? I have a large opal ring with quite a big chip in the middle and a thin crack. Is there any way of filling the crack with gel or buffing the stone to get rid of the crack? Also, where would I go to get this done. Would jeweller's do this or just stone specialists? Thanks for your help!
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