Red Topaz is an exotic variant of topaz. A good hardness and desirable colors, combined with a relative abundance and availability makes it one the most popular gemstones. The most valuable colors of Topaz are the golden orange-yellow type, called Imperial Topaz, and the dark pinkish-red and orange-red colors. Value increases with a deepness of color in orange and reddish hues. Red topaz has been found in Mexico among other locations. The most commonly used colors of Topaz in jewelry are the blue types.
| Chemical Formula | Al2SiO4(F,OH)2 |
| Color | Red, Orange, Brown, Pink, Colorless, Gray, Multicolored |
| Hardness | 8 |
| Crystal System | Orthorhombic |
| Refractive Index | 1.610Â -Â 1.638 |
| SG | 3.4Â -Â 3.6 |
| Transparency | Transparent |
| Double Refraction | .014 |
| Luster | Vitreous |
| Cleavage | 1,3 - basal |
| Mineral Class | Topaz |
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