Potomac Crystal Rivoli 10mm - Mix Pack. These high quality rivoli feature a pointed foiled back to increase the reflection and add dazzling sparkle to your projects. These crystals have no holes and can be used with a variety of bead weaving and wire working techniques to include them into your designs. Have fun getting inspired by this collection of assorted colors to create with. The Potomac Crystal Rivoli can be used in designs calling for Swarovski 1122. They measure 10mm and come in a pack of 10.