Cathy, the pearl in the ring is 11.68 mm. I can't tell you how many times I've had that mounting in and out of my cart...but I love it. And so glad I went with it. Rio just listed a whole selection of 14k pearl rings which look really cool. The ring is a size 7, which is a bit too big so I'm wearing it on my middle finger...nice to have something beautiful to adorn that finger when the bird flies! The pearl on the ring is really exceptional. It looks like a perfect round but it is slightly off, and has this wonderful color changing effect from pink to green because of very subtle banding (no indentations on the surface, just bands of color).