The term 'jewelry measure' can be summarized as a unit of measurement used to determine the weight of precious stones, such as diamonds. The most common jewelry measure is the CARAT, which is a unit of mass equal to 200 milligrams. A CARAT is divided into 100 points, so that a diamond of 50 points weighs one-half of a CARAT. Carats are also used to measure the purity of gold, with 24-CARAT gold being the purest form.