Karu Arke jewelry is believed to be a collaboration of Kaufman and Ruderman in the 1940's, in New York City. The necklace pictured above is signed Karu Arke. This mark was used during the early 50's maybe earlier. Pieces created prior to the 1950's were marked Karu. They created jewelry until the 1970's.
This piece is available in my etsy shop Junking For Jewelry.