This rare gem is named after the Russian tsar Alexander II (1818-1881), the very first crystals having been discovered in April 1834 in Emerald mines near Tokovaya, River in the Ural mountains. The discovery was made on the day the future tsar arrived at maturity.Although the powder is a relatively young gemstone, it certainly has a history noble .Puisqu ' it shows both red and green, the main colors of old Imperial Russia it inevitably became the national stone of Tsarist Russia.
Beautiful powder premium, however, is very rare indeed and hardly ever used in modern jewellery.In jewelry antique Russian you can enter cross with a bit of luck, since Russian master Jewellers loved this pierre.Maître gemologist Tiffany George Frederick Kunz (1856-1932) was also fascinated by alexandrite and Office of the jeweller produces some nice set of rings and Platinum at the end of the 19th century sets and at the beginning of the 20th smaller siècle.Alexandrites were sometimes used in jewellery Victoria of England.
The magic of colors changing
The most amazing feature on this stone, however, is surprising to change its color capacity. Green or blue-green in broad daylight, powder becomes a soft red shade of red, purplish or raspberry red in incandescent light. This unique optical characteristic makes of most precious gems of all, especially in fine qualities.
Powder is very rare: it is due to its chemical composition .c ' is essentially a chrysoberyl, a mineral consisting of a colorless or yellow transparent chrysoberyl chrysoberyl cat eyes and powder colour-shifting (also in the eyes of cat varieties). It differs from other chrysoberyls contains not only with iron and titanium, but also chromium as a major impurity. And it is this very element that represents the spectacular color change. Rarely, vanadium can also play a role. According to the nomenclature of the Confederation, only chrysoberyls displaying a clear colour change can call alexandrite.
As many other stones precious, powder has emerged from millions of years, it is in a metamorphic environment. But unlike many others, its specific geological conditions necessary training. Elements chemical beryllium (a major component in chrysoberyl) and chromium (agent dye powder) have chemical characteristics of contrast and not as a rule appear together, usually found in different types of rocks. Not only the nature has these different types of rocks in contact with each other, but a lack of silica chemical element, element more often in the Earth's crust) is also necessary to prevent the growth of the Emerald. This geological scenario occurred that rarely in the history of the Earth and, consequently, powder crystals are very rare.
Today not only the Russia
Russia remains the main source of powder since the jewels of the Ural Mining became available on the market. When have believed that Russian deposits have been exhausted, concerned the miracle of unique color decreased - especially since other mines Alexandrite virtually never displayed the coveted colour change.But the situation has changed dramatically in 1987, when the Alexandrite were discovered in a place called Hematita in Minas Gerais, Brazil.Alexandrite Brazil showed both a distinctive colour change and good clarity and colour. Thus, the image somewhat blunt the miraculous Pierre has received another pouce.La color stones Brazilian shot is certainly not as strong as Russian alexandrite green, but the color change is clearly noticeable. Hematita today is one of the largest deposits of powder in economic terms. Sometimes the powder with chatoyancy is discovered, not yet observed in Russian powder effect. Alexandrite is also obtained from sources in Sri Lanka, but the hue of these compares stones less favourably with that of the Uralian Alexandrite.They appear green in the light of day and a red-brown in artificial light.Tunduru Tanzania South region has also produced some outstanding specimens since the mid-1990s 1990.On also found Alexandrite India, Burma, Madagascar and the Zimbabwe.Although this stone is still considered a rarity, specialized distributors gem, stocks all trade improvement of relations between the Russia and the rest of the world have ensured a better supply Russian Alexandrite in the market.
A precious stone for experts and lovers of precious stones
With its good hardness of 8.5, powder is a decidedly stone bear.The most distinct colour change, the most precious stone.A fine powder must demonstrate a bright-green blue in the light of day and a purplish red artificial light, without any trace of unwanted Brown or gris.Si the origin of the stone is known beyond dispute Russia, we are talking about a real scarcity of enormous value.Alexandrite finely faceted above a carat are therefore among the most expensive stones in the world, more rare than fine Ruby, Sapphire and emerald.
Powder is a stone for experts, amateurs and connoisseurs, a stone of understatement true.Son uniqueness and high value are not obvious at first vue.Le mysterious color change only happens on different sources of lumière.Mais exposure if you get really involved in the powder, you will be totally be fascinated by this jewel. maybe you will also feel some mysterious magic and attributed to elle.Il lore is considered a very good augure.Dans stone critical situations, it is supposed to strengthen the intuition of the wearer and thus help the him or her ways new pass in situations where the logic does not provide a réponse.Poudre is also renowned for creativity and inspire the imagination.This entry was posted on Wednesday, October 24, 2007 at 12: 11 pm and is filed under News Shanore.Vous can follow responses to this entry through the RSS 2.0.Vous feed can leave a response or trackback from your own site.