Each month has at least one gemstone. Here is what you need to know about August's birthstones: peridot, spinel and sardonyx.

Did you know that one of the world’s most popular and largest rubies has never seen the light and is not a ruby at all? Let’s ...

This story may make you go from green to red. If you were born in the month of August, you are most likely a Leo or (for those born after August 23), a Virgo. You have also been long accustomed to ...

Spinel, MgAl 2 O 4 (download cif), is a rare gemstone that was used to imitate rubies. The structure has face-centered cubic symmetry, and is a little heavy to understand. The general formula is AB 2 ...