Human: Is there a way to tell if a diamond is real or fake? Assistant: 
There are many different ways to determine the authenticity of diamonds. One method involves using a gemological instrument called a “diamond tester” which can be used to measure the refractive index and dispersion characteristics of a diamond. Another popular method for determining the authenticity of a diamond is by looking at its clarity grade, cut, color, and carat weight. Additionally, a diamond may also be checked for chemical impurities and radiation damage.