30 Day Returns + Free 2-day Shipping

The term “table” in the diamond industry refers to the flat facet that can be seen when the stone is sitting face up. A diamond’s table is important for more than one reason. First, it is the largest facet of your diamond. Second, it plays an important role in your diamond’s brilliance.

The diamond’s table is the largest flat surface it has. Its purpose is to refract the light that enters and to send the refracted light back into the observer’s eye.

Getting Table Proportions Just Right

One might be tempted to think that a larger table percentage equals better brilliance, but this isn’t necessarily true. There are many factors that contribute to brilliance, and having a table that’s too large can detract from your diamond’s brilliance.

A table that’s too large would mean that the diamond’s bezel and upper girdle facets have less surface area, which decreases light dispersion. A small table would disperse more light, but it would likely have brilliance issues.

To build the perfect diamond, it’s important to balance light dispersion with color dispersion. So, table proportions are more of an exact science than most people realize.

How Table Percentage is Calculated

Table percentage equals the size of the table divided by the diamond’s girdle diameter. A table percentage of 58% means that the table is 58% as wide as the diamonds border.

For round diamonds, gemologists use table diameter in their measurements. For fancy diamonds, they divide the table width by the widest part of the stone. You can calculate the table percentage of any diamond yourself by using the following calculations:

  • Round diamonds – table diameter/girdle diameter
  • Fancy-shaped diamonds –table width/widest part of the stone

How to Use Table Percentages

So, now you know how to calculate a diamond’s table percentage. What does that do for you?

If you also have the diamond’s depth percentage, you can determine whether a stone will be aesthetically pleasing. These two percentages will tell you how the stone is cut in relation to its unique proportion.

These values are especially helpful when you’re shopping for a diamond online because they are proof that a diamond has good brilliance or sparkle. If you want to get the most brilliance from your stone, look at the diamond table proportion within ideal cut diamonds.

Table Percentage Chart

 

Excellent

Very Good

 

Round

53-58

52-53 or 58-60

 

Princess

67-72

59-66 or 73-75

 

Cushion

61-67

58-60 or 68-70

 

Privacy Policy