Here's some FYI on the subject:
(1) Many online diamond wholesale or retail (whichever you choose to call them) outfits will send a stone or two to a local jeweler of your choice for you to inspect before actually purchasing. No money up front. Eliminates the chances of being sold something other than what you think you are buying... at least you have the chance to inspect it yourself.
(2) Online diamond "wholesale" prices are a joke. No better than retail stores on average, some much worse. Really. Didn't find a single "wholesaler" that was anything close to what I'd consider wholesale.
(3) If you need to buy a diamond (a decent sized one, at least), do a search on diamond wholesalers in the nearest big city. For me, that happens to be New Orleans. Call a few and ask if they sell only to retail stores or if they will sell to the end customer as well. I found a very polite one that agreed to let me view and purchase their stones directly. Prices at least 50% off retail. Beautiful stones.
(4) If at all possible, find a connection to someone that can purchase diamonds wholesale directly from New York. After scrounging through my entire families "people network" I found that my father was a long time customer of an Oklahoma diamond wholesale outlet, and that this guy was willing to send a stone to me directly from New York on consignment... several if I wished, with only a marginal fee for handling. Prices? At 1/3 to 1/4 retail. Probably 25% lower on average than the New Orleans wholesaler.
(5) I know Diamonds aren't worth anything like what they charge... but what's a man to do? If it truly makes her happy, it makes me happy as well.
(6) Unc - my watch is solid tungsten carbide. Damn near scratch proof... much more so than titanium. As a mechanical engineer I find that very cool, and due to the look (a polished smoky silver color) and durability of the metal I find it tremendously more valuable to me than a solid gold or solid platinum watch would be. I'm pretty sure I'll get a matching wedding band.
Summary - I no longer need online diamond recommendations. Having found a direct link to the North American diamond capitol, I don't think I can get better prices without having a direct connection to the European supplier market.