Diamonds 101: Reference Guide
The information displayed in this section of our web site will help you to group specific characteristics of diamonds and to determine the quality of a gemstone.
The Diamond Cut
First, do not confuse diamond "cut" with "shape". Shape refers to the general outward appearance of the diamond, (such as round, emerald, or pear). When a diamond jeweler (or a diamond certificate) says "cut," that's a reference to the diamond's reflective qualities, not the shape.
Cut refers to the angles and proportions a skilled craftsman creates in transforming a rough diamond into a polished diamond. Based on scientific formulas, a well-cut diamond will internally reflect light from one mirror-like facet to another and disperse and reflect it through the top of the stone. Diamonds that are cut too deep or too shallow lose or leek light through the side or bottom, resulting in less brilliance and ultimately, in value.
Because cut is so important, several grading methods have been developed to help consumers determine the cut of a particular diamond. In general, these grades are:
- Ideal
- Premium
- Very Good
- Good
- Fair & Poor