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EDUCATION

DIAMOND SHAPE
Overview
Round
Princess
Emerald
Marquise
Heart
Pear
Asscher
Oval
Radiant
Cushion
Length-To-Width

At Adiamor, 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. All of our certified diamonds are graded by the GIA or AGSL to have FL-SI2 clarity, D-J color, and Ideal, Very Good, Good, or Fair cut. Our Affinity Collection diamonds are the finest quality diamonds available, and we offer them in round, princess-cut, Asscher-cut, and emerald-cut shapes.

Choose Your Diamond Shape
Since all diamond shapes are very different, unique characteristics determine quality for each shape. Select your shape below to learn how to recognize the most beautiful diamond. If you have additional questions, feel free to contact one of our Diamond and Jewelry Consultants who can help you find the diamond that's perfect for you.

Round

Princess

Emerald

Marquise

Heart

Pear

Radiant

Oval

Asscher

Cushion
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 diamond. 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.

To maximize the brilliance of a traditional round diamond, select one in the two highest cut grades, ideal or very good, and choose ideal, excellent, or very good polish and symmetry grades. For the finest ideal round diamonds available, view our selection of Affinity Ideal round brilliant cut diamonds.

1/4 (.25) Carat to 1/2 (.50) Carat Round Cut Diamonds
1/2 (.50) Carat to 3/4 (.75) Carat Round Cut Diamonds
3/4 (.75) Carat to 1 (1.00) Carat Round Cut Diamonds
1 (1.00) Carat to 1 1/4 (1.25) Carat Round Cut Diamonds
1 1/4 (1.25) Carat to 1 1/2 (1.50) Carat Round Cut Diamonds
1 1/2 (1.50) Carat to 1 3/4 (1.75) Carat Round Cut Diamonds
1 3/4 (1.75) Carat to 2 (2.00) Carat Round Cut Diamonds
This is our most popular non-round diamond. Its beautiful brilliance and unique cut makes it a favorite for engagement rings. The princess has pointed corners and is traditionally square in shape. When choosing a color grade, consider that while the price of a J-color non-round diamond is exceptional, color may be slightly visible in its corners. Also, princess-cut diamonds can vary greatly in how square or rectangular they are. To find the dimension of princess you want, look for the length-to-width ratio in our interactive diamond search and on each diamond's detail page. This will determine what the diamond will look like when viewing it from above.

1/4 (.25) Carat to 1/2 (.50) Carat Princess Cut Diamonds
1/2 (.50) Carat to 3/4 (.75) Carat Princess Cut Diamonds
3/4 (.75) Carat to 1 (1.00) Carat Princess Cut Diamonds
1 (1.00) Carat to 1 1/4 (1.25) Carat Princess Cut Diamonds
1 1/4 (1.25) Carat to 1 1/2 (1.50) Carat Princess Cut Diamonds
1 1/2 (1.50) Carat to 1 3/4 (1.75) Carat Princess Cut Diamonds
1 3/4 (1.75) Carat to 2 (2.00) Carat Princess Cut Diamonds
An emerald-cut diamond is a rectangular step cut diamond. A step cut diamond has sloping, four-sided facets that are cut with rectangular facets to create a unique optical appearance. Due to its larger, open table, this shape highlights the clarity of a diamond.

If you choose an emerald-cut with a lower clarity grade, such as SI, be sure to review the clarity plot on the diamond certificate. Also, emerald-cut diamonds can vary greatly in how rectangular they are. If you'd prefer an emerald cut with a squared outline, look for an Asscher-cut diamond. To find the shape of emerald you want, look for the length-to-width ratio in our interactive diamond search and on each diamond's detail page. The length-to-width ratio will determine the diamond's outline, or what it will look like when viewed from the top.

1/4 (.25) Carat to 1/2 (.50) Carat Emerald Cut Diamonds
1/2 (.50) Carat to 3/4 (.75) Carat Emerald Cut Diamonds
3/4 (.75) Carat to 1 (1.00) Carat Emerald Cut Diamonds
1 (1.00) Carat to 1 1/4 (1.25) Carat Emerald Cut Diamonds
1 1/4 (1.25) Carat to 1 1/2 (1.50) Carat Emerald Cut Diamonds
1 1/2 (1.50) Carat to 1 3/4 (1.75) Carat Emerald Cut Diamonds
1 3/4 (1.75) Carat to 2 (2.00) Carat Emerald Cut Diamonds
The shape of a marquise diamond can maximize carat weight, giving you a much larger-looking diamond. This brilliant-cut diamond looks beautiful set with round or pear-shaped side stones, and the length of the marquise makes fingers appear long and slender. To find the dimension of marquise you want, look for the length-to-width ratio in our interactive diamond search and on each diamond's detail page. The length-to-width ratio will determine the diamond's outline, or what it will look like when viewed from the top.

1/4 (.25) Carat to 1/2 (.50) Carat Marquise Cut Diamonds
1/2 (.50) Carat to 3/4 (.75) Carat Marquise Cut Diamonds
3/4 (.75) Carat to 1 (1.00) Carat Marquise Cut Diamonds
1 (1.00) Carat to 1 1/4 (1.25) Carat Marquise Cut Diamonds
1 1/4 (1.25) Carat to 1 1/2 (1.50) Carat Marquise Cut Diamonds
1 1/2 (1.50) Carat to 1 3/4 (1.75) Carat Marquise Cut Diamonds
1 3/4 (1.75) Carat to 2 (2.00) Carat Marquise Cut Diamonds
The heart is the ultimate symbol of love. The unique look of the heart-shaped diamond helps make it a distinctive choice for a variety of diamond jewelry. When choosing a color grade, consider that while the price of a J-color heart shaped diamond is exceptional, color may be slightly visible in its corners. To find the dimension of heart-shape you want, look for the length-to-width ratio in our interactive diamond search and on each diamond's detail page. The length-to-width ratio will determine the diamond's outline, or what it will look like when viewed from the top.

1/4 (.25) Carat to 1/2 (.50) Carat Heart Shaped Diamonds
1/2 (.50) Carat to 3/4 (.75) Carat Heart Shaped Diamonds
3/4 (.75) Carat to 1 (1.00) Carat Heart Shaped Diamonds
1 (1.00) Carat to 1 1/4 (1.25) Carat Heart Shaped Diamonds
1 1/4 (1.25) Carat to 1 1/2 (1.50) Carat Heart Shaped Diamonds
1 1/2 (1.50) Carat to 1 3/4 (1.75) Carat Heart Shaped Diamonds
1 3/4 (1.75) Carat to 2 (2.00) Carat Heart Shaped Diamonds
This brilliant-cut diamond is also called a teardrop for its single point and rounded end. The unique look of the pear shape helps make it a popular choice for a variety of diamond jewelry. If you choose an elongated pear shape, the length of the diamond creates a subtle slimming effect on the fingers.

1/4 (.25) Carat to 1/2 (.50) Carat Pear Shaped Diamonds
1/2 (.50) Carat to 3/4 (.75) Carat Pear Shaped Diamonds
3/4 (.75) Carat to 1 (1.00) Carat Pear Shaped Diamonds
1 (1.00) Carat to 1 1/4 (1.25) Carat Pear Shaped Diamonds
1 1/4 (1.25) Carat to 1 1/2 (1.50) Carat Pear Shaped Diamonds
1 1/2 (1.50) Carat to 1 3/4 (1.75) Carat Pear Shaped Diamonds
1 3/4 (1.75) Carat to 2 (2.00) Carat Pear Shaped Diamonds
This beautifully unique shape is nearly identical to the emerald-cut, except that it is square. Also, this shape has a pavilion that is cut with rectangular facets in the same style as the emerald-cut. If you choose SI-clarity be sure to view the clarity plot on the diamond certificate, because this shape highlights the clarity of the diamond. When choosing a color grade, consider that while the price of a J-color non-round diamond is exceptional, color may be slightly visible in its corners.

1/4 (.25) Carat to 1/2 (.50) Carat Asscher Cut Diamonds
1/2 (.50) Carat to 3/4 (.75) Carat Asscher Cut Diamonds
3/4 (.75) Carat to 1 (1.00) Carat Asscher Cut Diamonds
1 (1.00) Carat to 1 1/4 (1.25) Carat Asscher Cut Diamonds
1 1/4 (1.25) Carat to 1 1/2 (1.50) Carat Asscher Cut Diamonds
1 1/2 (1.50) Carat to 1 3/4 (1.75) Carat Asscher Cut Diamonds
1 3/4 (1.75) Carat to 2 (2.00) Carat Asscher Cut Diamonds
An oval diamond has beautiful brilliance that's similar to a round diamond. Oval diamonds are also very popular as their length can accentuate long, slender fingers. To find the dimension of oval you want, look for the length-to-width ratio in our interactive diamond search and on each diamond's detail page. The length-to-width ratio will determine the diamond's outline, or what it will look like when viewed from the top.

1/4 (.25) Carat to 1/2 (.50) Carat Oval Cut Diamonds
1/2 (.50) Carat to 3/4 (.75) Carat Oval Cut Diamonds
3/4 (.75) Carat to 1 (1.00) Carat Oval Cut Diamonds
1 (1.00) Carat to 1 1/4 (1.25) Carat Oval Cut Diamonds
1 1/4 (1.25) Carat to 1 1/2 (1.50) Carat Oval Cut Diamonds
1 1/2 (1.50) Carat to 1 3/4 (1.75) Carat Oval Cut Diamonds
1 3/4 (1.75) Carat to 2 (2.00) Carat Oval Cut Diamonds
Trimmed corners are the signature of this diamond, and they help make the radiant-cut a popular and versatile choice for jewelry. A radiant-cut looks equally beautiful set with either baguette or round side-diamonds. Radiant-cut diamonds can vary in their degree of rectangularity. To find the dimension of radiant you want, look for the length-to-width ratio in our interactive diamond search and on each diamond's detail page. The length-to-width ratio will determine the diamond's outline, or what it will look like when viewed from the top.

1/4 (.25) Carat to 1/2 (.50) Carat Radiant Cut Diamonds
1/2 (.50) Carat to 3/4 (.75) Carat Radiant Cut Diamonds
3/4 (.75) Carat to 1 (1.00) Carat Radiant Cut Diamonds
1 (1.00) Carat to 1 1/4 (1.25) Carat Radiant Cut Diamonds
1 1/4 (1.25) Carat to 1 1/2 (1.50) Carat Radiant Cut Diamonds
1 1/2 (1.50) Carat to 1 3/4 (1.75) Carat Radiant Cut Diamonds
1 3/4 (1.75) Carat to 2 (2.00) Carat Radiant Cut Diamonds
This unique shape has been popular for more than a century. Cushion-cut diamonds (also known as "pillow-cut" diamonds) have rounded corners and larger facets to increase their brilliance. These larger facets highlight the diamond's clarity, so if you choose an SI clarity grade, be sure to review the clarity plot on the diamond certificate. Cushion-cut diamonds are available in shapes ranging from square to rectangular. To find the dimension of cushion you want, look for the length-to-width ratio in our interactive diamond search and on each diamond's detail page. The length-to-width ratio will determine the diamond's outline, or what it will look like when viewed from the top.

1/4 (.25) Carat to 1/2 (.50) Carat Cushion Cut Diamonds
1/2 (.50) Carat to 3/4 (.75) Carat Cushion Cut Diamonds
3/4 (.75) Carat to 1 (1.00) Carat Cushion Cut Diamonds
1 (1.00) Carat to 1 1/4 (1.25) Carat Cushion Cut Diamonds
1 1/4 (1.25) Carat to 1 1/2 (1.50) Carat Cushion Cut Diamonds
1 1/2 (1.50) Carat to 1 3/4 (1.75) Carat Cushion Cut Diamonds
1 3/4 (1.75) Carat to 2 (2.00) Carat Cushion Cut Diamonds

Length to Width Ratio

Length to Width Ratio is an important factor in choosing your diamond and is often overlooked. Differing length to width ratios can make a princess cut stone appear rectangular or square and make a marquise shaped stone either appear long and thin or shorter and wider. While ultimately the length to width ratio of a stone is a matter of aesthetic preference, there are a set values that are considered ideal for each of the various fancy shapes. These values are chosen to minimize the bowtie effect of the stone.

Length to Width Ratio:

Below, the fancy shapes we sell at Adiamor are shown along with their ideal length to width ratios. You may click on any of them and enter a number before clicking the "Submit" button to see an approximation of the a diamond with the given length to width ratio.

What is the "Bowtie Effect"?

The "bowtie" of a diamond refers to a dark spot in the shape of a bowtie that is present in fancy shaped stones. This effect is caused by light leaking out of the bottom of the stone rather than being reflected back to the top due to the unique shape of the stone. Round stones, with their complete symmetry, are the only shape which are do not have a bowtie and therefore do not require a length to width ratio.

How do I calculate Length to Width Ratio?

Calculating the length to width ratio is fairly simple. Simply divide the measurement (generally in millimeters) of the length of the stone by the width measurement. These measurements will appear in the top left portion of your diamond's grading report. They are listed as length by width by depth. So, if a 1.00 carat princess cut diamond had the measurements 5.86mm x 5.67mm x 3.89mm, you would take the length (5.86mm) and divide it by the width (5.67mm). The depth, while factoring highly into the Cut Grade of the diamond, is not important in finding your length to width ratio. After dividing the two, you get a factor of 1.03. This is your ratio and can be thought of as representing the length of the diamond if the width was represented by 1. This is considered an excellent length to width ratio for a princess cut stone and will appear square.

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