This is a Preferred Assets Certified 5.25 Carat Amethyst. The papers say : Description-Amethyst, Laboratory Control-J17294, Comparative List-$525.00, Carat Weight-5.25, Specific Gravity-2.65, Refractive Index-1.55, Moh's Hardness-7.0 and Dispersion-0.013. It is signed and stamped. I have had this so long I have no idea where I got it. Any questions please email.