A diamond’s length to width ratio tells how squared or elongated its shape is. The ratio is calculated by dividing the length of the diamond by the width. For example, if a diamond’s length is 6mm and its width is 4mm, the length to width ratio is 1.50 – rectangular shape. On the opposite side, a length to width ratio close to 1 looks like a square, because the length and width of the diamond are similar.
The ideal shape for an Emerald Cut Diamond is rectangular, with the ratio classically ranging from 1.30 to 1.60. Most people choose a ration close to 1.50, however you may have your own preference for a slightly wider or longer shaped diamond.