Crystal Clear Authentic Round Watch Crystals, 5/pkg. A watch crystal is a transparent cover on a watch face, but to Artists, it's a whole lot more. You will receive 5 watch crystals in a variety of sizes as pictured in the photo. The watch crystals are accurately cut(diamond turned with micron accuracy), crystal clear and unbreakable. You can fill the watch crystals with sequins, beads, a photo, tiny buttons, etc., you decide. Try cutting your own image to use too. Just glue the crystal onto whatever paper craft project you are working on; ATCs, cards, altered works of art, etc.