Birks Art-Deco 2.50 Carat Old-Mine Cut Diamond Engagement RingLadies magnificent platinum Art Deco Birks diamond engagement ring featuring a 2. 50 carat Old Mine cut diamond of (SI) in clarity and (M N) in color. Further enhanced by (2) single cut diamonds on the side. Currently a finger size 5 1 2 but can be resized. Circa 1930s (+ ). Hallmark: Birks Overall good condition. Accompanied by a Van Rijk appraisal certificate