1940s Red Spinel and Diamond Trilogy Ring

A 1940 natural red spinel diamond 18ct gold and platinum set trilogy ring, set with a central 1.65ct vibrant bright red spinel and old European cut diamond ring, the diamonds total over 1ct 0.5cts each set in a semi rub over setting to protect the central spinel, marked 18ct and platinum on the shank, it would make a perfect engagement ring.