Victorian 18kt White Gold Black Opal and Diamond Navette Ring. Circa 1915Magnificent Victorian 18kt white gold Mine cut diamond and cabochon black Opals. The ring features 2 x 0. 90 total carat weight of Mine cut diamonds and 26 x 0. 60 total carat weight of European cut diamonds. Current finger size: 7. This ring can be resized. A truly spectacular piece of history and workmanship. Circa 1915. Very Good Condition. Accompanied by a Van Rijk appraisal certificate