Swarvoski Crystals are of leaded Crystal, are individually cut and polished, 34ss-48ss-Xilion Rose 28 Cut/14 Facet
Preciosa Viva Crystals are of leaded Crystal, are individually cut and polished 16 Facet Chanton Rose Cut
Czech Crystals are Highly polished Glass Rauten Rose Cut
Aproximate Size Conversions:
11mm-.433", 12mm-.472" 13mm-.511", 14mm-.551" 15mm-.708", 16mm-.629" 18mm-.787", 22mm-.866", 25mm-.984", 27mm-1.06"