Art Deco Cluster Ring With A 3.65 Ct No Heat Siam Sapphire & Diamonds On Rose Gold And Platinum

18K rose gold and platinum cmuster ring (hallmarked with owl and mascaron), the center of which is set with an unheated cushion-cut sapphire weighing 3.65 carats, surrounded by old-cut diamonds. Total diamond weight estimated at approximately 1.50 carats, estimated color I, estimated clarity VS to SI. The central sapphire is accompanied by its Carat Gem Lab certificate, specifying that it is a natural Siam sapphire without thermal modification. Art Deco work, circa 1930. Gross weight: 7.42 g. Motif height: 1.80 cm. Motif width: 1.50 cm. Ring size: 54 (diameter 17.15 / US 6.75). Condition: slight micro-scratches on the gold and stones, natural inclusions in the stones, slight irregularity in the setting, see photos.