I don’t know of a specific one located in the Dallas area, but diamonds generally cost around $6000 per carat depending on quality of course, a nicer one carat will normally run $7000-$8000 unless you want a REALLY nice one, like flawless, those are crazy expensive.
Something I think is really important it to actually LOOK at the diamond you want to buy, I mean the specific diamond because those grading certificates are basically the person grading the diamonds opinions on how good or bad the stone is. I recently looked at several diamonds, one being a VVS2 and another a VS1, the VVS2 which is supposed to be better was actually worse than the specific VS1 I looked at. So if you buy online keep in mind those gradings are people’s personal opinions not hard facts.
The Jewelry Exchange at Dallas….you will pay a little more since you are doing it all custom but the thought will be worth it I’m sure.
Do it online. You really can’t beat the quality for the price at bluenile.com.
If I was you, I would go to a jewerly store or online, but I wouldnt trust someone that doesn’t even have an office.
Good luck