An Art Deco yellow sapphire and diamond ring, France, 1920s, set with a step-cut yellow sapphire

An Art Deco yellow sapphire and diamond ring, France, 1920s, set with a step-cut yellow sapphire weighing approximately 7.00 carats, within a platinum mount set to the shoulders and openwork gallery with rose-cut diamonds, size J, French assay mark for platinum, indistinct maker's mark

Accompanied by Carat Gem Lab report no. CGL31400, dated 9th April 2024, stating that the yellow sapphire is of Sri Lankan (Ceylon) origin, with no evidence of heat treatment.