A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium.
![](https://i0.wp.com/explorebeautyofpakistan.com/wp-content/uploads/2020/04/Hunza-Ruby-Specimen-from-Hunza-Bujorin-Mine-800x600-1.jpg?fit=740%2C555&ssl=1)
The ruby Mine
A ruby is a pink to blood-red colored gemstone, a variety of the mineral corundum (aluminium oxide). The red color is caused mainly by the presence of the element chromium.
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