A gemologist’s measure of diamond/gemstone weight is expressed in carats.  A single carat is divided into 100 points.  Therefore a 75-point diamond/gemstone is the equivalent of a 3/4 – carat..  As the carat size of a given quality of diamond increases, so does its rarity and the per carat acquisition cost.  The internationally recognized gemological carat scale is set forth below:

   

 

A diamond/gemstone’s size is only significant when considered with cut, color, clarity, certification and the client’s confidence that the merchandise is beyond reproach.  The rarity and lack of rough material for larger diamonds/gemstones directly increases the per carat acquisition cost.