Diamonds - Gemstones - Jewelry
Gem Tool - for Diamonds and Precious Gems
Your Gem Material Selection
| Gem Material | Zircon |
| Group | |
| Mohs Hardness | 6.5 to 7.5 |
| Colors |
|
| Refractive Index | 1.777 to 1.987 |
| Dispersion | 0.039 |
| Pleiochroism | Varies |
| Specific Gravity | 3.9 to 4.71 |
| Double Refraction | +0.059 to |
| Transparency | Transparent |
| Fluorescence | Varies |
| Chemical Composition | Zr(SiO4) |
| Crystal System |  |
| Tetragonal System (four-sided or tetragonal),All three axes intersect at right angles. Two are equal in length and are in the same plane while the primary axis is either longer or shorter. Typical crystal shapes include four-sided pyramids and prisms and trapezohedrons. Occurences can also include eight-sided pyramids and double pyramids. |
Notes:
- Color designations for pleichroism and fluorescence generally follow our color description system. A "+" can represent either "strong" or "dark".
- "C" = colorless
- Transparency designations are those most commonly accepted for gem / jewelry quality material