Chatons have no holes, and require some kind of bezel to be mounted, either of metal or beaded.
Swarovski 8mm Chaton - Crystal
£1.00
Crystal Clear foil backed Swarovski Chatons. These stones, like Rivolis, have no hole for threading. They need to be mounted in a bezel, or beaded round like a cabochon or Rivoli. The photo shows two from the front, and one from the back. They come in a packet of 3.