that we have a clear understanding of your diamond quality needs. (The gem's shape, size, quality, and of course, your budget allocation.)
This can only be accomplished by visiting jewelers or discounters that handle stones that have been vetted by the GIA or the other three aforementioned jewelry trade laboratories (IGI, EGL, AGS). For later comparison, insist on receiving copies of the lab certificates for stones personally viewed, that best approximate your needs.
This in-field, eyes-on inspection is the only way that you can properly communicate your needs to us. Additionally, laboratory certs allow you to compare apples to apples and scientifically analyze which vendor is offering the best value for your money.