Mine is a 3 stone princess cut. All three diamonds equal 1 karat together, and the band is 14k white gold. I love it. DH picked it himself, all he knew was that I preferred princess cut.
I used a fake wedding band for almost a year because I couldn't find one that wouldn't take from the detailing of the engagement band. To sauter them together they would have to shave some of it off. Finally, a couple weeks before our 1st wedding anniversary I found a contoured band I liked, DH decided to purchase 2, 1 for the wedding band and 1 as a first year present and had them wrapped and sautered to my engagement ring.
This is how it looked before we got them all sautered (basically looks the same now, except it's all aligned and symmetrical):