If you take up James' suggestion of a claw setting, which I think would look good in this case, all you have to do is:
1. Perfect your crater with a round burr until the girdle of the stone just fits. This can be done by hand using a pin vice to hold the burr.
2. Make a cross out of thin wire ( 0.3 mm say).
3. Bend the arms down to make a four legged spider. Adjust the length and position of the legs to surround the crater and stand with all the feet in contact.
4. Solder in place and cut off the surplus, leaving four short claws to push over.
Notes on claws:
Claws are easier to push home if they are left quite long. However they can be very ugly, so once set they are best cut shorter and filed flat on top. The can be shortened with a fine saw blade, but for this size a fresh snap off blade of a craft knife would work fine. Dennis.
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