Unique and one-of-a-kind sculptural ring, created in Vancouver Canada by the artist goldsmith Karl Stittgen, back in the 1970. This ultra modernist cocktail ring was crafted with geometric patterns in solid yellow gold of 18 karats and accents in white gold for the settings of the gemstones. Diamonds: Mount in bezel settings, with 3 round brilliant cut diamonds, 0.11 carats, white colorless F/G color, VS-2 clarity. Tourmaline: Mounted in a bezel setting, with 1 rectangular step cut (10 x 6 x 5 mm) of a natural blue indicolite tourmaline of 2.47 carats. Weight: 15.45, (9.91 Dwt.). Size: 7 and can be easy resized. Measurements: 12 by 20 mm (0.59 x 0.79 Inches) and raise 12.50 mm over the finger. Hallmarks: Stamped with the maker's mark, the mark for the assay of the gold and signed, "STITTGEN .750". Very good conditions. Upon Request, Auction House may provide an appraisal. This will carry an additional cost. Appraisals are made by our in house GIA certified Gemologist. Literature: David Webb, The Quintessential American Jeweler. Ruth Peltason, Assouline New York 2013. Pages 168 for similar examples of this pattern.