Size 10.5, or 20.2 mm internal diameter (see images – those measurements are in millimeters). Ring band is approximately 11 mm at its widest point, measuring the band from above the top of the cross to below the bottom of the cross – See image. Gifted this ring in 2008. Worn intermittently for about 2 years. Ring has character with a worn look and rugged design. Both cross and interior of ring shine up well with cloth. Please note condition and expected wear in images provided associated with a piece of this age. Solid feel on your finger. Silver is somewhat malleable and will shape to your grip (at least that was my experience). And will include an unopened microfiber cloth for cleaning, primarily for the shining of the the cross and interior of ring.