Set 4mm stones perfectly. Simply sand your piece, Use your 4mm bur to drill into unfired metal clay. Go as deep as you would like the stone to sit. Extrude syringe into the hole making a nice DQ icecream swirl....
Push stone into hole using a toothpick and push in the centre so it will set straight. Your syringe will come up the sides and cover girdle. If it doesn't cover girdle add more syringe around stone.