- Color: pink, light violet, light greyish blue, colorless
- Hardness: 8 - 8.5
- Refractive index: 1.70 - 1.73
- Density: 3.61 - 3.70
- Chemical composition: BeMgAl4O8
- Crystal structure: Hexagonal
- Origins: Tanzania, Sri Lanka, China.
Taaffeite is one of the rarest collector's minerals. It has physical properties close to a Spinel, however Taaffeites reveal a double refraction effect, and crystals over 5 ct. are extremely rare.