1. Cut

When we buy diamonds we look first at the cut. The cut refers to how well the diamond is proportioned, not the shape. If cut properly it will have more brilliance and, as a result, will be more valuable than a poorly cut stone.

The certificate (example below) will tell you how the stone is cut. Look at the depth and table percentages. These percentage need to be between 53% and 65%. If lower or higher than this range, the stone will be too shallow or too deep. Both will adversely affect the beauty and the value.

Lesson #2 - Proportion & Depth - a visual demo!

Proportions are extremely important to a diamond's value. Always look for the proper table and depth percentages when determining the quality of the cut.

Click here for 2 visual displays of Table & Depth Percentages.

When light enters a diamond, it is critical that the depth percentage is neither too thin nor too thick in order for the light to be reflected back through the top of the stone and give it the brilliance you expect.

Click here for 3 visual displays of how light travels through a diamond.