you're getting a nice vintage amber ring it is marked 875 which in this country it means 18 karat but in other countries it's for sterling silver it does have a Maker's Mark SKR I'm not familiar with it with the Maker's Mark it tells you that the ring is from the Baltic states Russia Finland Sweden. I do test and guarantee everything I sell I guarantee it to be sterling silver. if you have any questions just ask. if you like jewelry check out my other items. thank you for taking the time to look and have a great day boxZA adorable antique artisan artisanal attention-getting bangle-style beaded