So this ring is beautiful!!!! Pompeii3 is beyond amazing and awesome. The center diamond is about 3mm which is about 1/6 to 1/4 of a diamond. This is a size 9 ring on my hand. The ring looks just like the images displayed on Amazon. The thickness of the halo ring is about 3mm which is thick and the band is about 1.5 mm. Some of the diamonds are a tiny bit cloudy but they all sparkle. Also, Chris and team are so helpful and accommodating. I hope the pictures help.