The Effect of a Diamond's Girdle
When purchasing a loose diamond, girdle is not a significant consideration, as a thinner or thicker girdle will not necessarily have a significant impact on the appearance of an otherwise well-cut diamond. However, the variation between the thickest and thinnest points on the girdle is considered in the assessment of a diamond's symmetry, as a significant variation can make a diamond appear disproportioned. For those seeking ideal cut diamonds, we recommend looking for a stone with a girdle rated somewhere between Thin and Thick. A perfectly proportioned diamond would have a Medium girdle rating, though ratings close to Medium are also considered to be expertly cut.
A diamond with an extremely thin girdle has a very slight risk of chipping along the girdle edge during setting or while being worn. For maximum protection, the diamond should be well-secured within the setting to minimize contact with hard or abrasive surfaces. A diamond with an extremely thick girdle will still have great brilliance and fire, as long as it is cut to otherwise ideal proportions. However, an extremely thick girdle concentrates a great deal of the diamond's weight in the middle, sometimes causing it to look smaller from the top than a diamond of a similar weight with a thinner girdle. When analyzing the impact of an extremely thick girdle on a particular diamond, it's important to evaluate the overall measurements of the stone. If the measurements are within the ideal range for the diamond's shape and carat weight, the extremely thick girdle does not have a significant impact on the perceived size.
Diamonds with an extremely thick or extremely thin girdle rating are sometimes priced lower than similar diamonds with more ideal girdle ratings, offering a great value to the consumer. If you have selected a diamond with an extremely thick or extremely thin girdle, please contact a Brilliance diamond and jewelry expert for a visual inspection before purchasing.