High Poly Ring.
Measure units are meters, size is 21 mm in diameter. Model is print ready. Gem is 3mm in diameter. But place for it is subtracted with 2.9mm gem.
Mesh is manifold, has no bad contiguous edges.
Wall thickness in most thiner places is about 1.5 mm.
Faces count: 864812
Available formats: .blend, .fbx, .stl, .obj, .dae.
Update: The scale is correct if you use meters as measure units, otherwise it may appear really tine in your scene. The file named mmScale.zip contains blend, stl, obj files that are suted for millimeters.