If you were to ask ten jewelers this question, you'd probably get ten different answers. As in any other profession, there's disagreement as to what's best for consumers. This article gives my opinions and recommendations. There are other qualified people in the trade that may disagree with some of them. You should base your choice of diamonds on the purpose for which it will be used. If you are buying a diamond for a wedding or engagement ring, it must be able to withstand a lifetime of daily w...