Education Hub

Diamond Cut

First and foremost, Blingster only offers “Very Good” and “Excellent” cut and polish features based on GIA scale for the customers.

What Does a Diamond’s Cut Mean?

Ever notice how a diamond has so many surfaces? The term “cut” describes how well-balanced a diamond’s proportions are and how its facets are arranged to produce sparkle and brightness. What is the ratio of the diamond’s depth to its diameter, for instance? The diamond’s beauty and cost are determined by these minute but crucial elements.

In addition to describing the diamond’s shape, the cut also describes how well the diamond reflects light back to the viewer’s eye. Regardless of color or clarity, a well-cut diamond can instinctive sparkling and brilliant, while a poorly cut diamond will look dull and lifeless.

Diamond Cut Diagram of shallow vs perfect vs deep


Which Diamond Cut Sparkles the Most?

The Gemological Institute of America (GIA) rates diamond cuts on a scale that ranges from Excellent to Poor, with Excellent being the highest possible grade. On this scale, the round brilliant cut is considered to be the diamond cut that sparkles the most, with a cut grade of Excellent reflecting its exceptional light performance. The round brilliant cut’s circular shape, with its 57 or 58 facets, is designed to maximize light reflection and dispersion, creating a mesmerizing display of brightness and fire. 

Is it possible that exact same carat weight diamonds have different measurements?

Diamonds with ideal or lower than ideal depth would have bigger appearance from the diamond that has more depth.

You could believe that the best strategy to purchase a diamond is to maximize spread by getting a shallow cut stone. After all, a reduced carat weight will result in a gemstone that appears larger. Although diamonds with a high spread have the benefit of looking bigger, as a trade-off, they will also lose their shine and brilliance. Despite having a greater spread, shallower diamonds will have light leakage and will look unattractive.

The following important parameters have to be met for a diamond to qualify under “Excellent” or “Very Good” GIA cut grade:

Overweight %: up to 16%

Total Depth: 56%-64.5%

Table: 50%-66%

Star Length: 40%-70%

Crown Angle: 26.5-38.5 Degrees

Crown Height: 10.5%-18%

Pavilion Angle: 39.8-42.4 Degrees

Lower Half Length: 65%-90%

Girdle Thickness: 2.5%-5.5%

The parameters above are part of a diamond’s anatomy. Click here to understand each.

Note: GIA grades only Round Brilliant diamonds for cut.