The alexandrite has a chameleon-like characteristics and is a rare chrysoberyl mineral. Compared with rubies, emeralds, sapphires and diamonds cheap promise rings, alexandrite is a rising star in the gem world. It is also a leader in the precious gem family because of its varied colors. Alexandrite is the June birthstone and the 55th anniversary memorial stone.

The Russian name of alexandrite is "Александрит", which is a variant of alumoberyl. The cat's eye is one of the five precious stones. In daylight, its color usually shows grayish green, yellowish green to blue-green; under incandescent light, it usually looks brown or purple, but it is very rare to reach bright colors. This is due to the complex process by which minerals absorb light. Because the stone name bracelet contains a trace amount of chromium, it has the strongest transmission to green light, followed by red light transmission, and strong absorption of other light. Therefore, in the daytime, due to the illumination of the sunlight, the green light is transmitted through the most, so it is green. With approximately white daylight lighting, the stone also appears blue custom necklace. However, in the evening, when red candles, oil lamps or tungsten incandescent lamps are illuminated, the transmitted red light is particularly large, so it appears red. The "changeable stone" is named after it. The color change is very remarkable family necklace, and it is the finest treasure. If the color-changing effect and the cat's eye effect are concentrated on a single gemstone, it is an extremely rare gemstone with extremely high value.

Because it has a green color in the sun and a red color effect under candlelight and incandescent lamps, many poets praise the stone necklaces for girlfriend as "the emerald in the day, the ruby in the night". It is said that the stone was first discovered in 1830 on an emerald mine in Urals, Russia. The miners dedicated this gemstone with the effect of discoloration to the Russian Prince Alexander II. On his 21st birthday, he set the new exotic stone in his crown and gave it the name "Alexandrite".

• Origin of the alexandrite

The alexandrites mother's rings are mainly found in gas-forming hydrothermal and pegmatite deposits. The main producing areas of the stone are located in a few areas such as Sri Lanka, India, Brazil, Russia, Madagascar, etc., and the resources of the Russian Ural Mountains, which were found to have alexandrite in the early years, have been exhausted.

• Counterfeit Alexandrite

Artificial alexandrite is not common in the market, but there will be color-changing synthetic sapphire to imitate it. They are usually transparent, large and contain little inclusion. Be careful if someone offers you alexandrite at a low price and there are several to choose from.

• Market Analysis of Alexandrite

The factors that affect the price of alexandrite are mainly the effect of discoloration, size, transparency and number of defects. Generally speaking, the more obvious the discoloration effect, the higher the price, such as emerald green during the day and bright red at night. However, under normal circumstances, there are very few gems with such obvious discoloration effects. Generally, they are dark green during the day and red-brown at night, that is, dark green tourmaline during the day and garnet red at night. Alexandrite is a treasure in gems and has a high collection value. It is very rare to be more than 5 carats.