Here is a substantial brutalist ring by the Danish company Smykkesmeden, registered in Copenhagen from 1973 to 83. The ring has an open+back shank made of silvertone metal, on top of which perches a slice of uncut brown quartz, the top of which shows the crystal formations. This is all held in place by a silver frame and silvertone wires.
Condition: Excellent, no visible damage
Marks: Smykkesmeden, Danmark
Size: Open back, but quite rigid, Currently fits finger size UK M, US 6.5, Eu 53-54