Round Flat back Hot-Fix Rhinestones for Alexandrite making,Similar to Austrian Swarovski Crystal,Whole Sizes & Color Round Flat back Hot ... Described:Crystal, clear, diamond-like* Genuine Crystal: Amethyst, SS 6 to SS 34, Multi-faceted Cut, Silver Foil Backed, Flatback Rhinestones ... that melts at the touch of an iron, hardens afterward to attach stone when it cools. Perfect for anything : - Garments , ...