This hidden halo ring is designed for a 7.25mm center stone. Can be printed and cast. It is currently a size 4, but can be easily resized in CAD. If you purchase this ring, and would like the finger size adjusted, please let me know and I will get it done for you. The center stone can also be adjusted for a small fee, or you can easily do it if you know CAD. All metal and diamond information is provided in the images.