Cushion & Elongated Cushion Diamond RatiosUpdated 2 months ago

The ratio is calculated by dividing the length of the diamond by the width. For example, if the diamond length is 10.5mm and the width is 8mm, the diamond ratio will be 1.3. 

A square cushion has a ratio of 1.00 - it is the same length and width. Elongated cushions are generally considered those with a ratio over 1.10, but we tend to look for those from around 1.20. 

A lower ratio equates to a wider, plumper cushion, and a higher ratio reveals a narrower, elongated shape. 

The dimensions of a diamond can be found on the diamond certificate. They are listed as length x width x depth.