A couple of rings for him and her. Cabochon can be made from amber, moonstone, etc. Fixed by 4 prongs each with eagle claws style.Sizes 6 and 8 (US), 16.5 and 18.1 mm. Cabochon shape gem size 6.0 x 4.0 x 2.5 mm.Approximate weight shown in the picture.Files is checked for errors by Magics software. Can be easily resize. Model is ready for prototyping on CNC and 3D Printing. If you have any questions, please contact me.