Two things distinguish Lazare Diamonds from all the other diamonds. The first and most important is that all Lazare Diamonds are cut to ideal proportions. The ideal cut is a mathematical formula for cutting diamonds to precise angles and proportions to gain the optimum reflection and refraction of light. Second, every Lazare Diamond .18 carat and above has a logo and an individual identification number specially laser inscribed on its circumference. The logo is proof of authenticity as an ideal cut Lazare Diamond. The unique number is proof of ownership.