A chrysolite, tourmaline and heliodor ring, Portugal, 19th century, of navette outline with a beaded

A chrysolite, tourmaline and heliodor ring, Portugal, 19th century, of navette outline with a beaded border, pavé-set with cushion-shaped chrysolites and green tourmalines, centring on an oval heliodor, mounted in gold, size U, later shank