This gemstone weighing in at 3.68 carats displays a lively purple tone that reminds us of delicious grapes. Rivalling the beauty and price of amethyst, this gemstone is popular for its extremely high refractive index and exceptional brilliance. To the untrained eye, at first glance, it may look like amethyst, but when light enters, you will witness its sub-adamantine (almost diamond-like) luster and wonderful purple color. This jewel’s rich purple color is due to the strong presence of magnesium and iron within the stone.