Ruby is the mineral corundum which has the traces of Chromium element which causes the red colour in the ruby. This can range from an orangy red to a purplish red.
- Ruby is a one variety of the corundum mineral species, that also contains sapphire.
- Ruby is valued for its beauty and can earn high per-carat costs. It is, without a doubt, one of the most valuable gems in the coloured stone industry.
- Corundum is a colourless mineral in its purest form.
- Colour changes are caused by trace elements that become a component of the mineral’s crystal structure.
- The amount of chromium in a ruby determines how intense the red colour is; the more chromium, the stronger the red colour.
- Fluorescence can be caused by chromium, which intensifies the red colour.