Crystal Rhinestone Rondelles are the perfect spacer to add the shine and sparkle of crystal between gemstones, glass, pearls, or metal beads. Designed to nestle against or between any beads 6mm or larger, these specially designed spacers have a wheel shape with a concave metal center. This puts the solid band of colored crystals outward facing in your design and forms a functional joint with the bead next to it. Potomac Crystal Rhinestone Rondelle Spacers 6mm are 6mm in diameter with a 3mm thick outward facing profile.