PL 18K 18K 18K 9K 9K 9K PA PL 18K 18K 18K 9K 9K 9K PA Length: 4.37mm Length: 4.37mm Width: 4.35mm

Princess Cut Diamonds

Princess Cut Diamonds

A Princess Cut diamond is the second most popular diamond shape and is fast growing in popularity due to its clean lines and glamorous amount of sparkle.

Princess Cut Diamond Top View

Princess Cut Diamond (Top View)

Princess Cut Diamond Side View

Princess Cut Diamond (Side View)

Outline Square; sharp, unclipped corners
Cutting Style Brilliant
Description Exquisite, sparkling diamond with a contemporary edge
No. of Facets 57
Ideal L/W Ratio 1.0


Square is the new Round

Though technically the Round Brilliant is better optimized to reflect the maximum amount of light, the Princess Cut comes very close and is an excellent choice if you’re looking for the ultimate sparkler. It’s perfect for those who want the fire of a Round Brilliant in a less traditional form.

We Say

Look for a stone with the optimal length-to-width ratio of between 0.98 and 1.02 for that crisp square profile.


A Princess Cut diamond is also sometimes known as a Square Modified Brilliant Cut. It typically has 57 facets - 21 on the crown, 4 on the girdle, and 33 on the pavilion, although Princess Cut diamonds with only 25 facets on the pavilion are also common.

Princess Cut Diamond Top View

Princess Cut Diamond (Top View)

Princess Cut Diamond Side View

Princess Cut Diamond (Side View)

Shop loose princess-cut diamonds

Due to its design, the Princess Cut requires more of the carat weight to be directed towards the base of the stone to maximize brilliance, which means a Princess Cut stone will appear smaller than a Round Brilliant of the same carat weight. Despite this, a Princess Cut diamond retains approximately 80% of the original rough diamond crystal compared to the Round Brilliant’s 50%, so Princess Cut diamonds are usually better value weight for weight.

Unlike other square styles (Emerald and Radiant) the Princess Cut does not have clipped corners. If choosing a Princess Cut, bear in mind the sharp corners are a point of weakness and can be easily chipped so ensure they’re protected by the setting.


Currently, there aren't any universally accepted standards for grading the cut of Princess Cut diamonds so certifying laboratories don’t do it. Instead, it’s down to individual retailers to evaluate the quality of the cut for this shape. 

We’ve developed our own criteria to provide consistent cut grading for all the Princess Cut diamonds we offer. These take into account factors such as table and depth percentage, polish and symmetry, and length-to-width ratio. 

Refer to the table below to see how we grade Princess Cut diamonds.

  Excellent Very Good Good Fair Poor
Table % 57%-72% 55%-75% 54%-80% 52%-85% <52% or >85%
Depth % 62%-73% 60%-77% 57%-83% 55%-84% <56% or >84%
Polish / Symmetry Good to Excellent Fair to Excellent Poor to Excellent
Ratio (L/W) 1.00-1.02 1.00-1.04 1.00-1.05 1.00-1.07 <1.00 or >1.07


The Princess Cut is a generic cut, meaning it hasn't been patented by or attributed to one designer. It emerged in the 1960s and has its basis in the 15th Century French Cut, which was used to create typically square or rectangular stones with a ‘cross’ pattern clearly visible in the crown. Compared to the French Cut, the Princess Cut has more facets giving it much more sparkle.

Over the years, the term Princess Cut has been used in connection with other styles of cut, such as the Profile Cut designed by Arpad Nagy (London, 1961).

In 1971, Basil Watermeyer of Johannesburg introduced the ‘Barion’ Cut, a square cut diamond with 4-fold mirror-image symmetry, clipped corners, and a total of 81 facets. The Barion Cut has since faded into obscurity but it is generally considered to be the forerunner of the Princess Cut we know today.

Length to Width Ratio

The accepted norm for a Princess Cut is square rather than rectangle, so look for a length-to-width ratio as close to 1.0 as you can get. The price is slightly lower for a Princess Cut diamond with a length-to-width ratio greater than 1.05, but bear in mind at this ratio it will start to look more rectangular in shape. 


As the second most popular shape, there are many styles of jewellery settings designed for the princess cut diamond giving you much more choice than you might have for, say, a Marquise.

Because of its pointed corners, a Princess Cut diamond requires a four-claw setting to prevent chipping. 



Shop princess diamond rings

A contemporary classic, the Princess Cut is both fashionable and elegant, with a clean, sparkling style that’s designed to last. It’s the best of both worlds for those who want the fire, brilliance and scintillation of a Round Brilliant in a neat, modern package.

A Princess Cut looks good on almost all hand types but is ideal for long fingers as the horizontal lines balance the vertical. 

Shop princess diamond earrings

We have featured the following collection of princess cut diamond jewellery, which are all available to buy online: 

We also have an additional range to choose from, which we can source on request, so feel free to contact us if you can't find what you are looking for.

Of course, we are more than happy to help you design your own bespoke princess-cut diamond jewellery. Click here to find out more.

For more inspiration, why not follow us on Instagram @QualityDiamonds

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