This is a very nice set of modernist stackable puzzle rings created in Denmark by Georg Jensen. These fusions rings were designed by Nina Koppel and carefully crafted in two tones of solid 18 karats gold with high polished finish. These fusion free-forms rings can be used individually or as a trio since each ring fits the other like puzzle figures. Total weight: Combined is 16.3 grams. Size: Each one is 7. Ring width: 0.45 inches. Hallmarks: They are stamped with the post 1945 maker's mark cartouche, the marks for the assay and warranty of the 18kt gold, the designer's initials name NK, the European size and signed in full as follows, "GEORG JENSEN DENMARK .750 52/53 NK". Very good conditions. All our diamonds and colored gemstones are naturally earth-mined. Any synthetic (lab-grown) stones will be clearly indicated in the description. Upon Request, Auction House may provide an appraisal. This will carry an additional cost. Appraisals are made by our in house GIA certified Gemologist.