Often described by gem aficionados as “emerald by day, ruby by night,” alexandrite is the very rare color-change variety of the mineral chrysoberyl. - GIA
Alexandrite appears purplish in daylight where a full spectrum of visible light is present and blueish under incandescent light which emits less green and blue spectrum. This color change is independent of any change of hue with viewing direction through the crystal that would arise from pleochroism.
Alexandrite is a type of chrysoberyl, a rare oxide mineral and the hardest ,most durable gemstones you can find. Alexandrite is scarce owing to its unique chemical composition as in addition to iron and titanium, it contains high quantities of chromium as an impurity, partially replacing aluminum.Due to this impurity spectacular green hues of this June gemstone can be seen. Synthetic alexandrite makes this beautiful, color changing gem available at a very affordable price.
These Synthetic Lab created alexandrite mostly grown by Czochralski method (pulled alexandrite) and by floating-zone method. The Czochralski process, or pulled alexandrite technique, is a method of crystal growth used to obtain crystals (especially rod-shaped single crystals), metals and salts. The process starts with melting the materials of appropriate composition in a crucible. To make alexandrite crystals by Czochralski method, beryllium and aluminum oxides were melted together in a crucible with addition of vanadium, chromium and ferric oxides. A seed crystal mounted on a rod is immersed into the melt where it starts to rotate. The crystal’s rod is then pulled upwards slowly and rotated at the same time. By precisely controlling the temperature gradients, rate of pulling and speed of rotation, it is possible to extract a large, single crystal from the melt.
Then our specialist engineers cut these stone from rough to get best lab created alexandrites making it to have same composition as real alexandrite.
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Keywords: Lab Grown Diamond