Antique Belle Époque sapphire and diamond 'toi et moi' two stone ring

Antique Belle Époque sapphire and diamond 'toi et moi' two stone ring in platinum and 18kt yellow gold. Set to top with an oval mixed cut sapphire in a platinum claw setting, set to bottom with a round Old European cut diamond in a platinum claw setting, to a vertical two stone design with floating collets, curving claws and met to the centre with trumpeting shoulders set with twelve cushion shape Old Mine cut diamonds in platinum grain settings tapering and terminating to a solid shank. Hallmarked platinum and 18kt gold, French.