The English name for the stone is Alexandrite, the Russian name is “ÐлекÑандритâ€, and the transliteration is “Alexander Stoneâ€. The stone is called the purple jade. Because of its green color in the sun and the red color effect under candlelight and incandescent lamps, many poets praised the stone as "the emerald in the day, the ruby ​​in the night". It is said that in 1830, the stone was first discovered in a mining emerald mine in Ural, Russia. The miners dedicated this gemstone with the effect of discoloration to the Russian Crown Prince Alexander II. On his 21st birthday, he The newly discovered gems are set in their own crown and given the name "Alexander Stone", meaning a stone. Like the cat's eye, the stone is a gold emerald in mineralogy, but it has two different gems because of its different optical characteristics. The stone is an orthorhombic system, and the crystal is often short columnar and plate-shaped. It can be discolored (green, red), transparent, translucent to opaque. The refractive index is 1.745-1.754, which is strong in dichroism and heterogeneous. The hardness is 8.5 and the density is 3.73 g/cm 3 . Excellent toughness. A weak red light can appear under both long and short-wave ultraviolet radiation.
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