first, an early 20th century three stone opal ring, size L, hallmarked Birmingham, 18ct gold; second, an opal doublet ring, size M, unhallmarked, stamped '9CT'; third, an openwork opal and split pearl pendant, stamped '9CT', curb link chain, length 41cm; fourth, an opal bar brooch, stamped '9CT' with a base metal pin, gross weight 11.8g (4)