A small quantity of jewellery

A small quantity of jewellery, including a black cultured pearl and diamond necklace, with a pair of matching drop earrings, a sapphire and diamond cluster ring, a tourmaline and diamond ring, the step-cut tourmaline weighs approximately 3.40cts and set in yellow gold with small round brilliant-cut shoulder diamonds, size R, together with a multi gem-set half-hoop ring, size M