I'm in the market for a diamond, and have done my requisite reading, am aware of the quality and cut issues, need for certificate, etc., but of course lack the experience to judge/grade a stone myself.Given that, how can I buy the stone I want from an Internet or wholesale dealer at a non-bricks-and-mortar price, but ensure both that I'm getting what I'm paying for and set things up so that the dealer is comfortable with the arrangement, too? (E.g. I presume that nobody would mail me a diamond on spec to be evaluated....) In case it's relevant, I'm in the Washington, DC area and am probably interested in a well-cut 1.1-1.3 carat stone around I/SI2.