Sublime 21.69ct incredibly large checker top Amethyst

This untreated amethyst features halo flashing under a domed checkerboard top that creates the illusion of a floating table. Its crystal clarity ensures that nothing takes away from its elegant presentation, while its glistening superior luster adds to it echoing light off of every facet. It measures 22mm x 16.4mm x 10.9mm, and is untreated. Sourced from Brazil. Mohs hardness rating: 7 out of 10