Here is a dramatic brutalist ring harbouring a large polished amethyst pebble, purchased in Denmark.   There are no marks on it to indicate the metal or the maker, and it was probably probably a one-off. or very small finger.

Qualifies for lower postal rate, refunded after dispatch. 

Condition: Excellent,

Marks: None

Size: to fit finger size UK I, US 4.5, Eur 48. The ring rises 2 cm above the shank. 

Year: 1970?