Very rare silver ring with niello inlay. These were produced in Kievan Rus from 10th to 13th century AD - this is a simpler early type. The inner diameter of the ring is about 19.5mm (about size 9 1/2), the silver is beautiful and stable. Very rare Kievan Rus artifact, difficult to find! You can read about the Niello inlay here on wikipedia: http://en.wikipedia.org/wiki/Niello