The sizes can be altered and the glaze, stone and bead colors can be customized on each. Possible stone choices include blues & greens: Turquoise, Chrysoprase, Malachite, Chrysocolla, Bloodstone, Sodalite & Picasso Marble. Reds & Oranges: Christmas Tree Jasper, Coral, Mary Ellen Jasper, Red Obsidian. Blacks & browns: Jade, Jet, Onyx, Tiger Eye, Goldstone & Dinosaur Bone. Purples: Charolite, Phosphosiderite & Turquoise