This looks promising. I like that the gear selection is limited to the higher-end items and I don't have to go through a bunch of garbage I'd never wear.
I do notice it's missing a few gems (Bright Living Ruby, Bold Ornate Ruby, Jagged Talasite, notably). Is that just part of 0.3's socketing being non-functional? I'd also prefer that the gems show the stats rather than, or in addition to, the names. I always get the names mixed up
Small UI suggestion. The drop-down arrow on each piece of gear partially covers the rating next to it. If you're just going through each piece seeing how it changes the rating, it's a minor annoyance to click off the selection cell. Making the value cell a bit wider is probably enough of a fix.
