There are bails that you can glue the tiles to and hang like pendants. These bails are available in a variety of finishes.
Or you can glue a square tube bead to the back of each tile, and string the tiles that way. A square tube bead would provide you with a secure bonding surface and have room for stringing material.
For most non-porous components, you can use Devcon 2-part jeweler’s epoxy to provide the best hold. Or review the ''Glue Types and Information'' chart for your other options.