When balancing the many characteristics diamonds have, the quality of the cut is a diamond’s most important attribute. The quality of the cut often has the strongest influence on a diamond’s allure & beauty. The quality of the diamond cut is measured by the balance of all its measurements in order to produce the most light from the top of a stone. If a diamond is too shallow, the light will be lost through the bottom of the stone. If it’s too deep, the light will fall through the sides.

A diamond’s cut quality can impact the visual look of its size, color and most importantly the way it sparkles for the wearer. At Mark Peter’s, we help you find the balance of cut quality along with carat weight, color, helping you pick the perfect diamond to fit your needs.


GIA® Cut Grades

diamond cut

Ideal Cut: A very limited number of stones. Roughly the top 5% of stones will reach this level of perfection. A diamond that is an “ideal cut” will reflect and shine nearly all of the light that enters it.

Very Good Cut: A diamond that sits at the top 15% of the quality cut scale. This is a beautiful stone, but the light pattern will be very slightly under the Ideal cut diamonds.

Good Cut: This diamond accounts for 25% of the diamond market based on their quality of cuts. These diamonds will reflect a majority of the light that enters them but will dance less for the eyes than an ideal cut or very good cut.

Fair Cut: A quality diamond, but not as brilliant as a good cut. With a fair cut, this can mean that the cutter worked to maximize carat weight or to avoid inclusions.

Poor Cut: These are diamonds that are significantly out of proportion with much too deep or too shallow cuts. This quality of cut will cause the diamonds to lose light either out of the sides or the bottom of the stone and reduce the diamond’s sparkle.


Diamond Shapes

A diamond’s shape is often one of the biggest decisions in the process of finding the perfect diamond.diamond cut


Brilliant and Step-Cut Diamonds

Diamonds that are brilliant-cut have facets that radiate from the center due to their triangular and kite shapes. Whereas step cuts are made from long and skinny stepped facets that are made to produce a house of mirrors effect.

round brilliant cut diamondROUND BRILLIANT CUT

The most popular shape for diamond engagement rings, it is also the most available shape of stone on the market. If you’re looking for very specific characteristics, often the most options will be found in round brilliant cuts. Over many years, the round brilliant cut has been perfected with a focus on producing the most sparkling and brilliant stones possible.

cushion cut diamondCUSHION

A cushion cut diamond is known for showing increased brilliance thanks to large facets and rounded edges. This brilliant-cut diamond can some times be difficult to distinguish between other cuts depending on how obvious the curves along each edge.

emerald cut diamondEMERALD

Cut with rectangular facets, featuring a large & open table, this cut isn’t uniform in its length-width ratio. Each stone is slightly different in shape/size. They can be longer, shorter or even square. Pay particular attention to clarity. The large open table draws attention to this characteristic, often with SI2 or worse stones, it can be easy to look through the table to find inclusions.

princess cut diamondPRINCESS CUT

Princess-cuts are known for sharp, pointed corners and beautiful fiery brilliance. While the shape is generally square, this characteristic will vary from stone to stone.

asscher cut diamondASSCHER

An asscher-cut diamond is very similar to an emerald cut but it is much more square. The length to width ratio on an asscher-cut diamond will be close to 1.

marquise diamond cutMARQUISE

A marquise is generally long and skinny with a focus on making the stone look as large as possible for the given carat weight. It will also make one’s fingers look even longer and skinnier.

radiant cut diamondRADIANT

A radiant cut diamond can be more square or more rectangular. You can distinguish them by their trimmed corners.

pear cut diamondPEAR

Pears vary in shapes of a teardrop. Like the marquise, this brilliant-cut diamond often makes one’s fingers look longer and slimmer. Avoid a pear-cut that features a strong “bow-tie” effect when looking through the top of the stone.

heart cut diamondHEART

A heart-shaped diamond is a distinctive choice of cut in exactly the shape we use to symbolize love.


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