Ametrine

Color: bi-color, violet / yellow Hardness: 7 Refractive index: 1.54 - 1.55 Density: 2.65 - 2.66 Chemical composition: SiO2 Crystal structure: hexagonal Lustre: vitreous  Origins: Brazil, Bolivia, Uruguay. Ametrine is a bi-color variety of quartz, formed by amethyst and citrine on opposite sides of a crystal. The best ametrines have intense colors and a distinct central border between the violet and yellow colors. To invest in Ametrine: www.gemsinvestors.com