I am a custom 3D designer from. All sizes weights and gem count are in pictures. For more information or for changes in files (putting supports change sizes or make in desirable weights) please write me. Modeling in Rhinoceros 5 .I give stl, obj, fbx, mtl formats also included ZIP archive with render pictures. I'm ready to answer your questions every hour. Good shopping.size Ring size USA 6 / 16.26 mm D. Ring size USA 7 / 17.04 mm D. Ring size USA 8 / 17.86 mm D. Ring size USA 9 / 18.68 mm D. Ring size USA 10 / 19.5 mm D. Ring size USA 11 / 20.32 mm D. Ring size USA 12 / 21.14 mm D.