LUX Austrian Crystal™ from Rhinestones Unlimited. Our exclusive Color Sample Card allows you to see the full spectrum of this crystal with your own eyes—over 80 colors and effects! For your convenience, 20ss flat back crystals are mounted on a clear acetate sheet. You can then place your project materials under the sheet to see exactly how the colors interact in your design. A size chart is printed on the back side. Colors may not be available in every size.