There are four primary aspects that are taken into consideration when a diamond is evaluated. These are usually referred to as the four C’s. They are carat, color, cut, and clarity. These set the standard for evaluations, and should also be considered when seeking to purchase a diamond. A certificate should be available to substantiate these facts. When the diamonds are sent to the jeweler, they receive a certificate for each diamond. If they do not have a certificate, be very wary of what you are buying.
Diamonds are not supposed to have any color. The rare case is in the exotic or rare diamonds that have a blue or even pink hue to them. The quality of the diamond is discerned through the letter rating it receives, D through Z. The closer to a Z rating that a diamond has, the less valuable that diamond is considered.
The next way that a diamond is evaluated is the carat weight. A carat of diamond weight is equivalent to 200 milligrams. For obvious reasons the greater the carat weight, the more valuable the diamond. Clarity ratings for diamonds are classified into 11 categories. These categories are from flawless to not so perfect. The closer the rating of the diamond is to flawless, the more expensive the diamond will be.
Finally, there is the cut of the diamond. While some discredit this as not being as important as carat weight or even clarity of the diamond, many feel this is the only classification that counts. The cut is not necessarily pinnacle to the value of the diamond, unless the cut is flawed. To tell whether the cut of the diamond is flawed, look at the diamond in a variety of angles and lights. A flawless cut on the diamond will be one where there are no dark patches on the diamond.