this is special modelsignet man ringhave stl and 3dm (rhino) files.
this is same style model : https://www.cgtrader.com/3d-print-models/jewelry/rings/men-rings-5-models-signet-ringthis is same style model : https://www.cgtrader.com/3d-print-models/jewelry/rings/signet-ring-special-model