I just love this ring I originally purchased the 1 1/2 ct version but the larger diamonds had too many carbon spots which I knew they would have since the diamonds were not of the highest quality which Pompeii3 does not lead you to believe they are clear on the diamond and quality. I should have just gone with this one its less then half the price and the flaws are sooo minor that they are not visible to the make eye I did take some measurements the center stone is between 4.5 to 5 mm. The ring feels sturdy and its beautiful . I posted some pictures. I am a size 9 for reference.