Cartier - Tank 
Lonely at home Cartier in 18K (750 thousandths) yellow gold centered with a radiant-cut diamond. weighing approximately 0.25 carat. half-bezel set. Ring branded and numbered by the house.
Eagle's head hallmark. witness to French work 
Master's mark.

Ring size : 54 
Gross weight: 6.48 g 

With box 

Excellent condition
Reference: DV0624-10