EARLY 20TH CENTURY PLATINUM AND OLD EUROPEAN CUT DIAMOND GEOMETRIC RING. Round old European cut diamond weighing approx 1.00 ct. held by corner prongs in square mount raised on square panel set with 14 smaller round diamonds, two pairs of additional round diamonds on shoulders of carved tapering shank. Ring riv - Ring size: 7 1/4. Estimate $1,500-2,500