An Art Deco carved blue chalcedony clip-brooch of bombé tonneau-shaped design set with a cabochon rose/orange sapphire and paired with a detachable triple strand necklace comprised of alternating sapphire and chalcedony beads of a later date, with 18k gold and sterling silver closure. Suzanne Belperron for René Boivin, France. Accompanied by an original Cailles & Salit certificate.