Cartier Trinity 18K Tri-Color Ring Sz. 51(US 5-3/4) – This Cartier Trinity ring features 18k white, yellow, and pink gold. Three symbolic colors: pink for love, yellow for fidelity and white for friendship. Small model; total weight is 3.9 grams. The ring is stamped 750, Cartier. Size 51(US 5-3/4). Cartier box and certificate included.