Ruby is the most valuable variety of the corundum mineral species and one of the most historically significant colored stones. The strength of ruby’s red depends on how much chromium is present. The more chromium found in the stone, the stronger the red color. The name ruby comes from the Latin word “ruber”, which means red. In ancient Sanskrit, ruby was called “ratnaraj” meaning king of precious stones. Rubies can command the highest per-carat price of any colored stone. It is a favorite gem among those in power and those in love, inspiring more emotion than almost any other stone. Ruby is the birthstone for July and the gemstone for the 15th and 40th anniversaries. As a symbol of passion, ruby makes an ideal romantic gift.