Silver modernist rings

These are some of the silver rings I bought recently. They are all silver and the ones in solid silver are marked 925. The one withe the tigers eye isnt't marked at all but it tested as silver.
The ring on the third picture is my favorite. I wear it a lot.
These rings look modernist to me but I m not sure. For all I know one could still buy these type of rings new. Does anyone have an idea about them? Thanks a lot!