GS Labs 0.55 Ctw Princess & Round Diamond 18KT White Gold Engagement Ring 2.75g. This ring is a size 4 1/2. Featuring one beautiful princess cut diamond with a carat weight of 0.43 ct. This diamond has a clarity of I1 and a color of F with very good polish and good symmetry. This ring also features 16 round brilliant cut diamonds with a total diamond carat weight of 0.12 ctw. These diamonds have a clarity range of SI2 to I1 and a color range of E to F with good polish and good symmetry. The total diamond carat weight of this ring is 0.55 ctw. This ring has been graded and certified by GS Laboratories. The GS Laboratories Certification Card lists the ring's weight as 2.40 grams, while our scale measures it at 2.75 grams. We believe this discrepancy is due to a resizing.