Silver ring with a large cut rock crystal

Modernist silver ring with a large rock crystal.

Silver ring in very good condition with wear that complies with age and use

adjustable ring size: approx. 17-17.25 mm at the moment

Hallmarks: OÖG, 830 Z9 = 1974 Örnéus Goldsmith in Älvsjö. This ring has Swedish import marks and I think it's imported from Finland to Sweden.