Antique French 1920's 1.10ct Cushion Old Mine Cut Diamond 18k Gold Platinum Engagement Ring

-Size 7 and fairly resizable (please inquire) -Hallmarks are quite worn, but remnants of dog head with eagle hallmark denoting 18k gold with platinum are faintly visible under high magnification. Tests as 18k gold and platinum -3.3g -1.10ct cushion old mine cut diamond, L-M/VS2 -Graded while mounted by a graduate gemologist -7.3mm wide at face -Rises 5.5mm from finger -1.9mm wide at back of band