Menu
Hardness (or Mohs Hardness) : 6.5 to 7
RI (Refractive Index) : 1.692 to 1.706 with birefringence of 0.013 approximatively
SG (Specific Gravity) : 3.35
| Dimensions in mm | Carat |
| 2,00 | 0,04 |
| 2,50 | 0,07 |
| 3,00 | 0,11 |
| 3,50 | 0,13 |
| 4,00 | 0,23 |
| 4,50 | 0,28 |
| 5,00 | 0,41 |
| 5,50 | 0,52 |
| 6,00 | 0,67 |
| 7,00 | 1,29 |
| Dimensions in mm | Carat |
| 4x3 | 0,18 |
| 5x3 | 0,38 |
| 6x4 | 0,65 |
| 7x5 | 0,96 |
| 8x6 | 1,45 |
| 9x7 | 2,03 |
| 10x8 | 2,85 |
| 11x9 | 3,55 |
| Dimensions in mm | Carat |
| 4x2 | 0,07 |
| 5x2,5 | 0,14 |
| 6x3 | 0,21 |
| 8x4 | 0,47 |
| 10x5 | 0,91 |
| 12x6 | 1,37 |
| Dimensions in mm | Carat |
| 3,0 | 0,07 |
| 4,0 | 0,17 |
| 4,5 | 0,30 |
| 5,0 | 0,36 |
| 5,5 | 0,51 |
| 6,0 | 0,6 |
| 7,0 | 0,97 |
| 8,0 | 1,38 |
| Dimensions in mm | Carat |
| 4x3 | 0,17 |
| 5x3 | 0,22 |
| 6x4 | 0,28 |
| 7x5 | 0,92 |
| 8x6 | 1,36 |
| 9x7 | 1,97 |
| 10x8 | 3,01 |
| 11x9 | 4,11 |
| 12x10 | 5,08 |
| Dimensions in mm | Carat |
| 5x3 | 0,16 |
| 6x4 | 0,31 |
| 7x5 | 0,55 |
| 8x5 | 0,69 |
| 9x6 | 1,11 |
| 10x7 | 1,51 |
| 12x8 | 2,42 |
| Dimensions in mm | Carat |
| 2,0 | 0,04 |
| 2,5 | 0,06 |
| 3,0 | 0,13 |
| 3,5 | 0,18 |
| 4,0 | 0,27 |
| 4,5 | 0,42 |
| 5,0 | 0,49 |
| 5,5 | 0,59 |
| 6,0 | 0,88 |
| 7,0 | 1,43 |
This blue zoisite can only be found in Tanzania.
A significant proportion of rough tanzanites have brownish yellow tints that can be removed by carefully heating the tanzanites up to 500°C.
Tanzanites should have a very high clarity as a heat-treatment could open a fracture or enlarge an inclusion in the gemstone and break it.
Handle tanzanite with care, avoid impacts.
Working with tanzanite requires a lot of care because its cleavage can be tricky.
- Pay more attention when using ultrasound and steam jets
- Thermal shocks should be avoided
- keep the tanzanite away from acidic substances
Clean with warm soapy water and dry with a soft cloth.