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imperial topaz
Karatz GemMagazine
" Imperial Topaz "
Topaz is broadly divided into two types depending on the elements it contains.
The F type contains fluorine and the OH type contains hydroxyl groups, and the OH type is generally called imperial topaz.
It is more rare than F-type topaz and is generally valued highly.
| English name | Topaz |
| Japanese name | Ougyoku |
| crystal system | orthorhombic system |
| chemical composition formula | Al 2 OH 2 SiO 4 *OH type |
| mohs hardness | 8.0 |
| specific gravity | 3.50 - 3.54 *OH type |
| refractive index | 1.63 - 1.64 *OH type |
| luster | glass gloss |
Colors that are a mixture of orange and brown, such as gold, orange, brown, pink, and red, are called sherry colors because they are close to the color of sherry.
In general, the higher the color, the more vivid the color, the higher the transparency without inclusions, scratches, or chips, the more beautiful the cut, the larger the size, the higher the value.
Furthermore, in the case of imperial topaz, it is said that the stronger the red color, the higher the value.
Red is the most valuable, followed by reddish pink and pink.
Sherry color is also very popular.
Brazil, Pakistan, Madagascar etc.