Assuming that's not a typo, you're not looking for a jeweler. Your best bet would be a store that carries a lot of accessories for young women - Claire's, Forever 21, and the Limited and similar stores you can find at a large shopping mall come to mind. You might also try Nordstrom's Rack.
For me the only reason to go local is if I absolutely MUST see the diamond or the setting quality first.
For an eternity ring at $20K I'd see no reason to go local.
UPS and FedEx deliver locally so I would not want to exclude 98% of the vendors from competing for my business.
I'd just want the best quality/price of any vendor in USA.
For rounds I'd start by checking out an ACA eternity band at www.whiteflash.com and a signature round eternity band at wwwlbriangavindiamonds.com
Call these vendors and ask whether all the diamonds can be their branded top cut.
www.goodoldgold.com is another fine vendor, but I don't know whether they have a branded line of top cut rounds, especially at that size.
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