''Étincelles'' ring in three golds and diamonds

Openwork ring in 18k yellow, rose, and white gold (750/1000) set with 17 old-cut diamonds, totaling approximately 1.87 ct (the central diamond weighing approximately 0.75 ct, another diamond of approximately 0.45 ct, and 15 diamonds of approximately 0.045 ct each). Width at the top: 3.85 cm. Ring size: 54.5. Total weight: 11.93 g. Eagle's head hallmark. Excellent condition.