19.5mm diameter. Fits comfortably on a size 10.5 (US) finger.
To convert ring sizes, print at the following scales:12.5 = 1.0811.5 = 1.0410.5 = 1.009.5 = 0.968.5 = 0.927.5 = 0.886.5 = 0.84[ALL RINGS REQUIRE BRIM]