Vintage marquise ring in 18k white gold with sapphires and diamonds

18k (750°/°°) gold ring set in its center with a beautiful colored oval sapphire weighing approximately 3cts in a setting of excellent quality diamonds (DEF/VS) weighing approximately 1.8cts. The royal blue color of the sapphire as well as its size make it a very good quality stone. French work from the 1980s. Presence of the eagle's head hallmark for 18k gold.

Finger size 49, size possible
Dimensions of the ring pattern: 21 x 13mm