This is my view on the diamond world, and I think most jewelers and gemologists would agree. However, there are opportunities for sellers to make more money by convincing you to put your money in less important factors – so be sure to check the specs of each diamond and know why the diamond is priced the way it is.
I should also let you know I am a very conservative grader. Gems that have been sent to GIA (Gemological Institute of America) or AGS (American Gem Society) are the best and have the best reputation. I base my grading reports from these organizations. Other certificates (such as EGL and IGI, etc.) require each gem to be taken on their own merit and seen before decided.
GIA developed a grading scheme for diamonds that they named the 4 C’s which stand for clarity, color, cut, and carat. This is my breakdown of the 4 C’s of a diamond: