Rhinestone Guy (RG) Premium (flatback) round Rivoli flat back crystals feature all around facets that come to a center point. In addition, the rivoli shaped stones feature foil on the back of the stone for extra reflection, except for the jet (black) which is unfoiled but highly polished for a beautiful shine.
These are great stones for all your projects.
The Rivoli flat back crystals are available in graduating sizes, as noted, from 10mm to 18mm (approx. 3/4 inch).