An opal bead and cultured pearl necklace

An opal bead and cultured pearl necklace, set with graduated opal beads, cultured pearls and rock crystal rondels, 89cm long, together with a sapphire and diamond ring, set in 18ct yellow gold, Birmingham hallmarks for 1987, size J 1/2, and a tourmaline and diamond three-stone ring, set in 18ct gold, London import marks for 1983, size L