The band is 13mm wide, tapering to 6mm at the back and the gemstone is 10mm by 8mm. The metal is brass with 2.5 microns of 18k gold vermeil so the gold should last a very long time. The reason we make many of our gold rings in brass, not silver, is that should the gold vermeil begin to wear off, (unlikely for a long time) it will not show through nearly so much on the brass, and give your ring a long life of wear.