Cartier 2.51 ct 18K Yellow Gold Round Brilliant Cut Diamond Solitaire Prong Set Engagement Ring. The ring weighs 11.7 grams and is size 7.5 (French Size 56). The center stone is a Round Brilliant Cut diamonds weighing 2.51 ct, J in color, VS1 in clarity. The diamond looks much whiter than the J color! The ring is stamped "MONTURE ©Cartier H4S00***" & "OR 750 56". The ring comes with a inner Cartier box, GIA certificate from October 17, 2018. The current retail replacement value at Cartier is approximately $60,000 +tax.