Stunning very big Art Deco / Arts & Crafts silver ring with a large rectangular smoky quartz stone in a prong setting. German, circa 1920, marked 835 for silver content. The stone, which has many naturally occurring inclusions, has been verified by a gemologist. Ring size 8. The top is just under 7/8 inch square. The stone is 17mm by 15mm. Excellent condition. No losses or cracks in the stone. Display form is life size. Photos enlarged to show detail.