A group of jewellery items

A group of jewellery items, including a yellow gold Quadrifoglio pendant by Elsa Peretti for Tiffany & Co on black thread necklace, a diamond single-stone ring, the round brilliant-cut diamond set in an openwork platinum mount, size N, a cluster ring set with a marquise-shaped emerald, a pear-shaped sapphire and a circular-cut diamond, with further circular-cut diamonds to the shoulders in yellow gold, size N, an amber-set yellow gold bracelet, 42cm long, a mother-of-pearl set gold brooch and a pair of cultured pearl-set gold scroll brooches