If the letter before 750 is Au, the material of this ring is 18K gold, and if it is Pt, it is 18K platinum. The circumference of the ring is 56 mm. 77727 stands for the independent code of the ring.

Cartier couple ring is a ring owned by Cartier company, which was founded in Paris, France, 1847. Cartier has become a royal jeweler in European countries, known as the jeweler's emperor and the jeweler of the emperor.