A sapphire and diamond ring

A sapphire and diamond ring, 1920s, claw-set with an oval sapphire weighing 12.97 carats, within a mount of ribbon design set with circular- and single-cut diamonds, the underside pierced with floral motifs, size M 1/2, stamped PLAT

Accompanied by report number 79216-27 dated 21 June 2019 from GCS stating that the cushion-cut sapphire weighs 12.97cts and is a natural sapphire with no indications of heat treatment. Origin: Sri Lanka (Ceylon)