Understanding Depth percentage and Table percentage of a diamond


If you’re really looking into diamonds and trying to get the perfect gem for your fiancé, it won’t take long before you come up against a situation where you make a search with all the 4C’s the same, but you still get a number of diamonds at widely different prices, like in this example and this.

Two significant factors in these differences are a diamond’s Depth and Table percentages. So here’s a little definition of each of these terms, and what you’re looking for in the perfect stone.


Table percentage: The value which represents how the diameter of the table facet compares to the diameter of the entire diamond. So, a diamond with a 60% table has a table which is 60% as wide as the diamond’s outline. For a round diamond, gemologists calculate table percentage by dividing the diameter of the table, by the average girdle diameter. Contrary to popular misconception, having a small table percentage (53% to 57%) does not make a round diamond any more brilliant than a diamond with a larger table.

Depth Percentage: Expresses how deep the diamond is in comparison to how wide it is. This depth percentage of a diamond is important to its brilliance and value, but it only tells part of the story. Where that depth lies is equally important to the diamond’s beauty; specifically, the pavilion should be just deep enough to allow light to bounce around inside the diamond and be reflecting out to the eye at the proper angle


Perfect Diamond Proportions: The depth percentage of a round diamond should range between 58 to 63 percent and the table percentage should range between 55 to 64 percent. The most desired percentages are the 60 percent, and perfectionists will look for depth of 59 through 62 percent and table of 56 through 58 percent. Round diamond is the best seller of all diamond shapes. The vast majority of sold diamonds are rounds.

If you’re looking for diamond suppliers that allow you to select factors like Depth and Table percentages of your diamonds which you can then add to a setting of your choice, here’s a few that also offer you the best prices :-

Blue Nile – USA and UK huge selection

James Allen – High quality site with great graphics

Union Diamond – Large Stock and quality site

Diamond Manufacturers – UK site with very keen prices

If you wish to find out more about what these suppliers have to offer and how they compare on price, you may  like to take a look at some of our informative videos.