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Diamond Shape Guide

At A. Fishman & Son, we apply the same high quality standards to all of our diamond shapes. We have an exceptional collection of traditional round diamonds and we also offer the finest non-round, or "fancy-shaped" diamonds available. Unlike other sellers, we invest our own money in our inventory so we are extremely careful in selecting our diamonds for your consideration.

Different Shapes of Diamonds

Click on the picture of the shape to search for diamonds.

Since all diamond shapes are very different, unique characteristics determine quality of each shape. Select your shape below to learn how to recognize the most beautiful diamond. You can also see actual photographs of our diamonds when you go to search for your diamond. If you have any additional questions, please feel free to contact our expert diamantaire, Josh Fishman, at 212-869-0085. Let us help you find the diamond that is perfect for you. 




The Round Brilliant Cut diamond is by far the most popular and most researched diamond shape available today. For almost 100 years, diamond cutters have been using advanced theories of light behavior and precise mathematical calculations to optimize the fire and brilliance in a round diamonds. In addition to being the most popular and researched shape, a round diamond will typically give you more flexibility in terms of balancing cut, color, and clarity grades while still getting the fire and brilliance you want.


Princess Cut

The Princess Cut's beautiful brilliance and unique cut makes it a favorite for engagement rings. The princess has pointed corners and is most beautiful when it is square in shape - its length to width ratio should be 1.05:1 or less. There is a lot more to understanding a princess cut though than just the measurements. There arrangement and dimensions of the facets in the bottom of the diamond, which is NOT reflected in the Certificate can make a huge difference between a brilliant Princess Cut and a glassy or shadowy one. Speak to us for a better understanding of this issue.

Cushion Cut

The Cushion Cut is a unique shape and has been popular for more than a century.  It has become extremely popular today. They have rounded corners and larger facets. They are also a "heavier" cut and do not show their full carat weight like round diamonds or other fancy shaped diamonds. To get the same "look" as a different fancy shaped diamond you need to get a larger Cushion Cut diamond. So, while the per carat price may be lower, for you to get the "look" you want, you may have to spend more to get a larger diamond.

RadiantRadiant Cut

Rimmed corners are the signature of the Radiant Cut and they help make this diamond a popular choice for jewelry and engagement rings. The prettiest radiant cuts are more rectangular in shape than square because the square shape tends to make the diamond look smaller than its weight would imply. So look for a length-to-width ratio which is more like an emerald cut but can be on the shorter side of that ratio.

EmeraldEmerald Cut

What makes an Emerald Cut different is its pavilion (the bottom of the diamond), which is cut with rectangular facets to create a unique appearance.  Due to its larger, open table, this shape can highlight imperfections in a diamond.  We do not carry many SI quality Emerald Cut diamonds because they are generally not clean to the naked eye. Even some VS2 clarity diamonds may have inclusions which are visible. Don't just check the clarity plot on the diamond certificate.  Call us and we can tell you first hand about the eye visibility of any inclusion you may have a concern about. After all, these are our diamonds.

Asscher Asscher Cut

This beautifully unique shape is nearly identical to the emerald cut except that it is square. The same cautions noted above for the emerald cut apply here as well.

Pear Shape

A Pear Shape diamond is also sometimes referred to as a teardrop shape because in its prettiest shape it looks like a teardrop with a rounded side and a pointed side.  For the most traditional Pear Shape diamonds, look for a length-to-width ratio of between 1.30 and 1.65.  Much longer shaped stones will look too narrow.



An Oval diamond has beautiful brilliance that is similar to a round diamond. Oval diamonds are also very popular as their length can accentuate long, slender fingers. For the most traditional oval diamonds, look for a length-to-width ratio of between 1.30 and 1.50.


The shape of a Marquise diamond can maximize carat weight, giving you a much larger-looking diamond. You can set this diamond with tapered baguette, pear shape or trilliant shaped diamonds and the length of the marquise makes fingers appear long and slender. For the most traditional marquise cut diamond, look for a length to width ratio of between 1.80 and 2.10 to 1.

HeartHeart Shape

A Heart Shape diamond is the ultimate symbol of love. The shape of a heart shape is very important and a heart shape which is wider than it is long, with nice rounded shoulders is the prettiest form of this diamond.