Setting the stone in these unsupported collets can be more easily done by pinching lightlly just above ( but never below) the collar of the stone with round/round or flat/round pliers, first north and south then east and west etc. The trick is to get the stone absolutely level and you seem to have done that really well. For finishing, the setting can be polished with different grades of cup-shaped rubbers on a screw mandrel and a slow running motor.
Hope you won't mind me writng all this' Dennis.
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