A pair of diamond ‘Boule’ earrings by De Grisogono, the bombé surmounts each pavé-set with brilliant-cut diamonds of silver tint, suspending an articulated row of collet-set similarly-cut diamonds and terminating in a spherical boule drop further set with brilliant-cut diamonds of silver tint, signed, maker’s mark, numbered, stamped ‘750’, total diamond weight approximately 25.00 carats, length 6.5cm. £7,000-£9,000