Alexandrite is a relatively new and exceedingly rare gemstone discovered in the 1830s that is prized for its ability to completely shift colors under different light sources. In daylight the stone is green to bluish green, but shifts dramatically to red, purple, or pink under incandescent light. While originally found in Russia, the stone is now sourced from Sri Lanka, Myanmar, Zimbabwe, and Madagascar. Although alexandrite is a relatively young gemstone, it certainly has a noble history. Since it shows both red and green, the principal colors of old Imperial Russia, it inevitably became the national stone of tsarist Russia. It was named, in fact, for Russian tar Alexander II, as the stone was discovered on the day he came of age. Top quality specimens, especially those in sizes over one carat, can easily surpass top quality sapphires and rubies in price per carat. Given this exceptional value and rarity, Alexandrite is considered by many jewelers and gemologists a precious stone alongside the traditional four.