MagiDeal 2pcs Adjustable Ring Bases Blanks Jewelry Findings Pad DIY Red Copper Material: Brass Ring Size: Approx. 26 x 21 x 19 mm/1.02 x 0.83 x 0.75 inch Cabochon Frame Inner Size: Approx. 25 x 18mm/0.98 x 0.71 inch Color: Red copper The cabochon frame measures approx. 25 x 18mm oval and the ring size could be adjustable.