The term GEMS' WEIGHT MEASURE is referring to the unit of measurement for the weight of gems, which is the CARAT (5 letters). A CARAT is a unit of mass equal to 200 milligrams and is used for measuring the weight of diamonds and other precious stones. It is divided into 100 points, so that a gem can be accurately weighed. The CARAT is an internationally accepted unit of measurement for gems and is used in many countries around the world.