Ruby was recognized as a corundum variety in 1800. Its name comes from ’rubeus’, the Latin word for ‚red’.
The strength of red in the ruby depends on how much chromium is present – the more chromium, the stronger the red color. Most of the high quality gems come from the Mogok Valley in Burma (now known as Myanmar), particularly deep red gems with a purple tone. Ruby deposits can also be found in other countries around the world, including Cambodia, Thailand, Afghanistan, Australia, Colombia, India, Japan and Brazil.
Few rubies actually grow large enough to crystallize into fine quality gems so these stones can be even pricier than diamonds.