Marguerite ring in yellow gold, platinum and diamonds

18k yellow gold and platinum ring (750/1000) set with diamonds. One old-cut diamond, weighing approximately 0.75 carats, surrounded by ten old-cut diamonds, weighing approximately 2.64 carats. Total diamond weight approximately 3.39 carats. Width at the top: 1.38 cm. Ring size: 55. Total weight: 5.04 g. Eagle's head and mascaron hallmarks. Excellent condition.