Tank ring in yellow gold, rubies and diamonds

18k yellow gold and platinum ring (750/1000). Set with diamonds and synthetic rubies. 18 old-cut diamonds, totaling approximately 1.54 carats (2 diamonds of approximately 0.15 carats, 4 diamonds of approximately 0.10 carats, and 12 diamonds of approximately 0.12 carats), surrounded by 6 synthetic rubies, totaling approximately 0.60 carats (each synthetic ruby ​​weighing approximately 0.10 carats). Width at the top: 1.73 cm. Ring size: 52. Total weight: 8.63 g. Hallmarked with a mascaron and owl. Excellent condition.