Share some key points about gem Ruby from the given text
1.	A ruby is a type of the mineral corundum that ranges in colour from pinkish red to blood-red. (aluminium oxide).
2.	One of the most well-liked traditional jewellery jewels is ruby, which is also quite strong.
3.	Other varieties of gem-quality stones are called as sapphires.
4.	Ruby, along with amethyst, sapphire, emerald, and diamond, is one of the classic cardinal stones.
5.	Ruby derives from the Latin word ruber, which means red.
6.	The element chromium is responsible for a ruby's colour.