Once completely dry I have filed around the edges.
Then I have coated the tile in Glossy Accents. When doing this you need to keep the nozzle in the liquid until you have finished, that way you get less bubbles and you just tease the liquid with the nozzle towards the edges. Leave somewhere safe to dry completely.
I drilled a small hole, affixed a necklace clasp and then made a necklace using ribbon.