Old European Cut 0.9ct Gold and Diamond Swirl Ring

18k (7500/00) gold ring called tourbillon set in its center with an Old European Cut diamond measuring approximately 0.9ct of estimated quality (J/VS1). The tourbillon is set with rose-cut diamonds totaling approximately 0.15ct.
French work from the 1920s
Presence of the eagle's head hallmark for 18 carat gold.
Gross weight: 4.1 grams
Dimensions: 1.7 x 1.5cm