Eweddingbands.com seems to have nice diamond bands for stacking, but I can't seem to find any real-life photos on PS. Please post if you have one...thanks!
Well, this is a little late but I'll include a picture anyway so it can help someone in the future. I have ordered five bands from e-weddingbands.com, just one of them a diamond band. I love stacking them and changing it up. I have the Isabella diamond band in 14k yellow gold. It is a VERY delicate band. I believe it tapers to only about 1mm on the underside, which makes it great for stacking. For such small stones, it has a nice amount of sparkle in good lighting. My only regret is that I ordered it in yellow gold instead of white. I think the pop of the white gold would've looked great with my other yellow gold rings.
I've really enjoyed all my experiences with e-weddingbands.com. They're fast, friendly and so far, the products have been a really good quality. I have my eye on another couple of bands to add to my stacking collection. Oh, and they're all a size 5.