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Education Home | Shape | Cut | Color | Clarity | Carat Weight | Certification | Care | Type IIa
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Interactive GIA Education Presentation
Length to Width Ratio:

Ratio:
The proportional relation between length and width of a diamond is called the ratio of that diamond.

How to measure the Ratio of a diamond?
Example: Radiant cut Diamond Measurement: 6.25 X 6.05 X 3.77 mm Measurement: Length - Width x Depth Length-to-width ratio: Length / Width = 6.25 / 6.05 = 1.03 (This will look perfectly square to the eye)

Preferred Ratio's:
Round:

Length-to-width ratio of Round Cut Diamond determines how a diamond will look like when viewed from above.
For round shaped diamond, look for a length-to-width ratio between 1 and 1.02.

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Princess:

When choosing Princess cut diamonds, you have to consider how square the stone is to ensure the outline of the stone when it is set on a setting. Some are perfect 1.00 or 1.01 ratio (length to width). The perfect square is more expensive than a slightly rectangular princess cut.
Length-to-width ratio of a Princess Diamond determines how a diamond will look like when viewed from above. For a square look to the eye choose a length-to-width ratio between 1.00 and 1.03.

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Emerald:

For a traditional Emerald cut, look for length to width ratio between 1.35 and 1.42

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Asscher:

Asscher Cut Diamonds, often called the square emerald cut, has cropped cut corners and step cut facets like an emerald cut. In choosing and Asscher cut diamond, you have to consider how square the stone to ensure the outline of the stone when it is set on a setting.
Some are perfect 1.00 or 1.01 ratio (length to width). The perfect square is more expensive than slightly rectangular asscher cut.
Length-to-width ratio of an Asscher Diamond determines how a diamond will look like when viewed from above. For a square look to the eye choose a length-to-width ratio between 1.00 and 1.03.

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Oval:

Oval Cut Diamond has stunning brilliance, due in large part to its facets, which are similar to those in a round diamond.
For an eye catching and beautiful oval shape diamond, the most popular length to width ratio should be between 1.35 and 1.45

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Marquise:

Marquise Cut Diamond is elongated with pointed ends. The length of the marquise can also make fingers appear longer and more slender.
When looking for a marquise shaped diamond, the most popular length to width ratio is be between 1.9 and 2.2

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Pear:

Pear Shape Diamond is a combination of oval and marquise cuts. The sparkling teardrop has good proportions and refracts the light well.
For a pear shape, the most popular length to width ratio is between 1.45 and 1.55. but some prefer a longer or shorter Pear.

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Radiant:

Radiant Cut Diamond is cut in the shape of a rectangle with cropped cut corners. Radiant cut diamonds can vary in how rectangular they are.
For a square radiant, look for a length to width ratio between 1.00 and 1.05. For a rectangular radiant, the length to width ratio should be 1.15 and higher.

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Cushion:

Cushion Cut Diamond Cushion cut diamonds can vary in how rectangular they are.
For a square cushion, look for a length to width ratio between 1.00 and 1.05. For a rectangular Cushion, the length to width ratio should be 1.15 and higher.

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Education and Guidance
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