Trinity ring by Cartier, Paris in 18k three-color gold: pink for love, yellow for fidelity, white for friendship.

The pink band is engraved "must de Cartier" on the outside.

Very elegant, timeless classical design.

This is an estate item with signs of previous use (can polish the ring before shipping). 

DETAILS:

Weight: 9.5 grams

Measurements: each band is approximately 3.5 mm wide;  

Stamped: 750 (European for 18K gold), hallmarked Cartier, numbered

Size: 58 (USA size 8.25)