Modernist silver oval fluorite ring 1970s

A silver and fluorite ring consisting of an oval cabochon of fluorite bezel set on a table topped mount with a wide tapered shank - marked 925 for Sterling indistinctly and unsigned - total weight 13.4grms - dimensions of face 21mm x 18mm - ring size U - please enquire to resize - c.1970 probably Scandinavian due to the quality of the make