In order to measure the size and weight of diamonds, gemologists use instruments of such sophistication that they can make an accurate measure of a stone even if it's already in a setting. This professional evaluation will give you the diamond's exact measurement and weight, as well as the details of its cut and quality. It will precisely point out all the individual characteristics of the stone. To ensure authenticity, this analysis must be done in an accredited laboratory such as the Gemological Institute of America, and a qualified professional must perform it with special gemological instruments. When choosing a shape it is best to trust your taste, there are no rules.
Shape does affect clarity.
Clean diamonds can, of course, be purchased confidently in any shape. Round Princess Marquise Oval Radiant Emerald Pear Heart Trilliant Caring for your Diamond Diamonds are the hardest substance on earth. Exposure during ordinary wear to perspiration and household chemicals, like chlorine and hair spray, can cause buildup that dulls the surface of a diamond. Periodic cleanings will keep the diamond brilliant and refractive. A solution of one part ammonia and six parts water can be used to clean diamond jewelry at home.