Platinum, Engagement 3mm Band, Size 5.25 Band width is 3 mm and consists of alternating round and baguette diamonds. (4) round 2.6 mm are .25 carat; (3) straight baguette are .25 carat estimated weights (2.80 x 2.30mm) . Total weight of band is .50 carat. Quality is VS clarity and F-G color. Ring size 5.25 and weight is 4.2 grams of platinum GIA Gemologist inspected and evaluated