Circa 1970s, 18k, Swiss. This hand-made Swiss modern ring has a wonderful hippie vibe. A magically prismatic 13.22 carat black opal is the main drama of this biomorphic style ring. Colors …red, green, blue, orange, yellow, magenta … all flow and float in the black with bright white diamonds completing the visual narrative. Effortlessly chic, this ring will become part of your signature style. Excellent condition.