Vintage mid-century modernist sterling silver ring by Anna Greta Eker of Norway. This design is called "Prism" and is one of her rarely-seen designs. I have 2 for sale and both are in pristine 'as new' condition and they are adjustable . I collect mid-century rings and get the best of the best. All of the hallmarks are present, Anna Greta Eker's makers mark of "AGE", as well as the conjoined "ND" for Norway Designs and the + for the Plus Workshop in Fredrikstad. Also marked "STERLING 925S NORWAY