These Black Color Cubic Zirconia flatback Stones are popular for Jewelry Settings and Project Designs.  

And some of customers prefer to use Synthetic Black Agate/Onyx Gemstones for their Designs, It's up to your choose. 

Contact ut to get the high quality of Flat-back CZ Black Gemstones and Agate Onyx Gemstones from China Suppliers and wholesalers.