Outcharmed! Our S86CZ. These have a 1mm Inside Diameter closed ring which will accommodate a 19 gauge jump ring or smaller. Because of its low cost, durability and close visual likeness to diamonds, the CZ or Synthetic Cubic Zirconia is a great substitution. They are 1.7 times denser than a diamond with just a slightly less refractive index. The CZ is visible from both the front and the back. Finish your connections with our sterling silver jump rings. A charming addition to your jewelry supplies!