Sure, size isn't everything, but when it comes to choosing a diamond for your engagement ring, it's important to be sure of the exact weight of your gem. That's why Leo Schachter Diamonds uses a special diamond scale to weigh the stones. The scale is so accurate that it has a door to shut out extra air that could throw off the accuracy of the measurements. The scale weighs the diamonds in carats, a term that derives from the word “carob,” because one carat weighs the same as one carob seed.
After the diamond is weighed, it's sent to the International Gemological Institute. This organization returns the diamond with a certificate that proves the diamond's authenticity and grades it according to the four Cs: cut, color, clarity and carats.