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Ruby Ruby

The ruby is a red corundum. The chemical formula is Al2O3. The ruby is the most expensive precious stone of the world. The ruby, the diamond, the sapphire and the emerald are the first class of precious stones. Rubies are brown-red, red and pink-red. The color is caused by admixtures of chromium oxide. Because of their color they are often mixed up with spinels which are much cheaper. The best rubies are in Burma, but there are also rubies in Thailand and Sri Lanka. On the Mohs' hardness scale, which starts with 1 and ends with 10, rubies has got the hardness 9. Mankind know rubies very long so there exist stories about the magical effect of rubies. Some of these stories tells us bad things about rubies. Some stories for example say that rubies kill their owner. The reason is probable that rubies look very serectful and mystical. Another important thing for precious stones is the carat. It is another thing than with gold. When we talk about precious stones 1 carat are 200 mg, so 1 g are 5 carats.

Data about the Ruby
Chemical formula Al2O3
Mineral class oxides
Crystal system trigonal
Hardness 9
Density 3.5 g/cm3 to 4 g/cm3
Color brown-red, red, pink-red
Line color white
Gloss glass gloss
Break shell
Fissileness perfectly

Author and Webmaster: Lukas Czarnecki

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Last Update: 03.11.2004