This is a line of 5, 2 raindrop and 3 waves, prism glass tiles. The tiles are 3 7/8'' x 3 7/8''. They are held by a metal channel. They're from a factory in Ma. they were once clear, but years of sunlight have changed them to this deep, rich purple color.
Raindrops and Waves amethyst Sun Glass Prism Tiles in Frame