Vintage Hans Hansen Silver and Smoky Quartz Box Ring Denmark 1970s

A vintage solid silver ring with a flat topped conical light brown smoky quartz set in a square silver box and mounted on a wide flat shank - This brutalist iconic design by Karl Gustav Hansen for Hans Hansen is part of a series using these custom cut stones and is included in many books about modernist silver - marked 925 for Sterling silver and for Hans Hansen of Kolding - total weight 19.3grms - dimensions of face 15 x 15 mm - current ring size approx L AU/UK (US 5.5) - c.1970 Denmark