What to Know About the Diamonds Carat Weight

100 Points of a diamonds light

Cut - Clarity - Color - Carat - 4 C's Carat: The standard unit of weight used for gemstones is a carat. One carat equals .200 grams (or 200 milligrams). Usually abbreviated ct. A diamond is measured by weight and is done in carats and there are 100 points in a carat. For example: a 2ct. weight diamond had 200 points and weight 400 milligrams.