The Lazare Diamond®, also called Lazare Kaplan Ideal diamonds, are cut to "ideal" proportions. The ideal cut is based on a mathematical formula that measures a diamond’s angles and proportions with exacting precision. This produces a diamond of great brilliance, sparkle and fire.

Also marketed as the "The World’s Most Beautiful Diamond™", Lazare Diamonds is the largest manufacturer of ideal cut diamonds.

Lazare diamonds are the first branded diamonds to be introduced. Every Lazare Diamond over 0.18 carats in size comes with a laser-insribed ID number on its girdle.