Dear Mia,
If you use 0.5mm sterling silver strip, you will probably need a punch and a hammer to set your stone. Fine silver can be pushed over by hand and as its melting point is slightly higher than sterling, it should not give you any trouble. However, flimsy strip will heat up much faster than a thicker base, so to begin with try heating through mesh from underneath, or at least keep the flame moving and avoid concentrating it on the strip.
If you can post a pic of your cabochon, I and no doubt others will tell you how to do it. Kind regards, Dennis.
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