Thin bezel (channel) mount for Rivoli stones (Swarovski or Preciosa) Pop the stone into the centre, make sure that the edges are sitting in the channel - and gently squeeze the base of the loop together yo close it and secure the rivoli.
Lead-free. Nickel-free. Cadmium-free. 14mm x 21mm Inside diameter (ID) is 12 mm. By the each.