CARTIER Solitaire “Tank” ring in white gold and diamond

Ring signed by Maison Cartier. Tank collection. in 750 thousandths (18 carat) white gold. set with a princess-cut diamond. with a total weight of approximately 0.1 ct. width on top: 0.35 cm. finger size: 49. total weight: 5.13 g. eagle head hallmark. numbered 86NK. excellent condition