World-famous Ametrine As of now Ametrine hasn’t earned any fame. There is the possibility that natural Ametrine will become rare due to limited deposits. Ametrine gemology Species: Quartz Color: Bands of yellow and purple Chemical composition: SiO2 silicon dioxide Crystal system: (Trigonal) compact Hardness: Specific gravity: 2.65 Refractive index: 1.54 – 1.55 Birefringence: +0.009 Color of streak: White Absorption spectrum: Cannot be evaluated Fluorescence: None