Sidonia's handmade jewelry - How to bezel a round rivoli and make it look like a square

Materials used for the amethyst ring: 12mm Amethyst Swarovski rivoli; 4mm and  ...  Amethyst bicones; Miyuki 15/0 rocaille seed beads - code 2006 Matte Met Dk Bronze. Size 13 beading needle; Size B (4lb) Fireline thread.