I found this seller on etsy the other day; Amethyst Soaps. I couldn't believe how realistic this soap is! It looks just like real, tumbled turquoise nuggets with the 'matrix' and everything!
Amethyst Soaps also sells soap shaped like, what else, amethyst crystals. Very pretty. Almost too pretty to use. I just love these. They'd be beautiful in a guest bathroom, or as a housewarming gift. I know what to get my mother for Christmas. She has a southwest decorated bathroom, and the turquoise soap would be perfect for it.