Natural Ametrine 5.17 ct – Purple/Yellow, Octagonal Cut, Untreated

Ametrine is a naturally occurring bicolor variety of quartz, combining purple amethyst and golden citrine within a single crystal. It is valued for its distinctive color zoning, which creates a clear visual contrast between violet and yellow tones, making each stone inherently unique.
Chemically composed of silicon dioxide (SiO₂), ametrine belongs to the silicate mineral group and crystallizes in the trigonal crystal system, like other quartz varieties. In gem-quality specimens, it typically displays a vitreous luster and transparent clarity.
The refractive index of ametrine generally ranges from 1.544 to 1.553, resulting in a soft, balanced brilliance rather than strong dispersion. Natural ametrine is found almost exclusively in Bolivia, where geological conditions allow the coexistence of both color zones within a single crystal.

Ametrine is a naturally occurring bicolor variety of quartz, combining purple amethyst and golden citrine within a single crystal. It is valued for its distinctive color zoning, which creates a clear visual contrast between violet and yellow tones, making each stone inherently unique.
Chemically composed of silicon dioxide (SiO₂), ametrine belongs to the silicate mineral group and crystallizes in the trigonal crystal system, like other quartz varieties. In gem-quality specimens, it typically displays a vitreous luster and transparent clarity.
The refractive index of ametrine generally ranges from 1.544 to 1.553, resulting in a soft, balanced brilliance rather than strong dispersion. Natural ametrine is found almost exclusively in Bolivia, where geological conditions allow the coexistence of both color zones within a single crystal.

With a hardness of 7 on the Mohs scale, ametrine offers good durability suitable for everyday jewelry when properly set and worn with standard care. It performs reliably in a variety of designs, particularly in pendants, earrings, and rings with protective settings.
Due to its characteristic color zoning, ametrine is often cut to emphasize the contrast between amethyst and citrine areas, making orientation and setting especially important. Its combination of durability, visual interest, and size availability makes it well suited for expressive, statement-oriented jewelry designs as well as distinctive everyday pieces.