Spinel is a gemstone that comes in a variety of colors. Pure Spinel is colorless, but impurities are responsible for the wide range of colors. The most valuable and desirable Spinel color is a deep blood red, though blue, yellow, orange, pink, and purple colors also make fine gemstones.
| Color | Various; Red and Pink to Blue to Mauve, Dark Green, Brown, Black |
| Mohs scale hardness | 8.0 |
| Specific gravity | 3.58 - 4.06 |
| Refractive index | 1.712 - 1.717 |