A smoky quartz and diamond ring by Pomellato, the cushion-shaped smoky quartz in a rubover setting, with a pavé-set brilliant-cut diamond claw to one corner and plain polished claw to another, in a broad tapering mount, signed, Italian assay mark, stamped ‘750’, numbered, smoky quartz measures approximately 26.0 x 20.5 x 17.1mm, ring size L-M. £2,000-£3,000