Marquise Diamond RatiosUpdated 2 months ago

Diamond ratios are 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 lower ratio equates to a wider, plumper marquise, and a higher ratio refers to a narrower, elongated shape. For marquise-cut diamonds a ratio between 1.75 and 2.25 is considered ideal, personal preference plays a significant role. 

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