The cut of a diamond directly influences both beauty and price. But because the cut grading factors in so many variables, buyers can find themselves going around in circles trying to figure it out. This article will make it a little easier for you.
What is diamond cut?
First things first: it’s not the shape of the diamond. But we’ll get to that.
The cut of a diamond refers to its unique proportions, symmetry and ability to catch and reflect light. The diamond cutter will cut many facets (or flat surfaces) at various angles, all over the diamond to affect how it looks and behaves in the light. In short, cut is what makes your diamond sparkle and shine. And when it comes to visual impact, a diamond depends more on cut than any of the other 4Cs.
Because cut brings so many variables into play, it can be extremely difficult to define. However, the main purpose of cut is to affect the appearance of the stone, and much of this is to do with how the different facets absorb and return light:
Brilliance: the brightness, or the amount of light the diamond returns
Fire: when the dispersed light appears as flashes or ‘rainbow’ colours
Scintillation: the intense ‘glittering’ when the diamond is moved.
Diamonds can be cut in almost unlimited ways. The size, angle and shape of every facet of your diamond greatly affects how the light interacts with your stone.
Types of cut
Only Round shape diamonds have a cut grade. However, being that this is the most popular diamond shape, it’s worth knowing what to look for.
When researching cut, it’s easy to get lost down a rabbit hole of information on girdle width, culet size, diamond depth percentage, and diamond table percentage. Fortunately, your GIA grading report has already taken these factors into account – the result is the awarded cut grade.
Maximum fire, maximum brilliance
Proportions are usually smaller
Excellent cut diamonds are the most expensive of all the cuts.