3/4 carats! There are 13 diamonds total and they graduate in size from bottom to top with the larger diamonds on top. I really tried to capture it's beauty in the photos so you can really see what you would be getting. The ring contours comfortably around any stone and enhances it so it blends in with many engagement ring settings.  It's about 4mm wide at the widest point on the band (top) and about 2 mm on the bottom.  Resizeable if need be.  Retails well over $1,000 (paid $1,000 on sale).