To set the stone, place it table-side down on a piece of stiff cardboard. Press the seat you’ve just made in the tubing straight over the stone. Holding the cardboard against the stone, turn the tubing so the stone is facing up.
Picturing the stone as the face of a clock, use a burnisher to gently push the edge of the tubing against the stone at the 12:00 position. Then push the tubing at the 6:00, 3:00, 9:00, 1:00, 7:00, etc. positions to capture the stone with even pressure (Figure 2). Use a burnisher at a 45º angle to further compress the rim of the tubing over the stone’s edge.