This delicate little band is perfect for stacking with other rings. The rustic oxidized finish will stand out nicely with other bright finish rings. If you like to fidget with your rings then you'll love the little bumps across the center. The circle is approx. .25 of an inch across, or exactly 6 mm. This listing is for the oxidized finish, but a bright or semi-matte finish is available upon request. Please include size and finish requests in the 'Message to Seller' box during purchase. Please see my profile and store policies section for more information about myself and my jewelry.