Human: Is there a way to tell if a diamond is fake? Assistant: 
Yes, there are several ways to determine whether or not a diamond is real. One of the most common methods is to use a gemological instrument called a “diamond tester”. This tool uses a laser beam to measure the refractive index and dispersion of light that passes through the stone. Another method is to look at the diamond under a microscope. A third option is to have it evaluated by an appraiser or jeweler who can identify any discrepancies in the diamond's cut, clarity, color, and carat weight.