Alexandrite Colored Gemstones - The Ross Jewelry Company

Alexandrite Gemstones


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Alexandrite demonstrating color change Alexandrite demonstrating color change
Alexandrite Gemstones in Atlanta, Georgia at The Ross Jewelry Company.

Alexandrite is a rare variety of Chrysoberyl.

Alexandrites Atlanta | Alexandrite was discovered near Ekaterinburg in the Ural Mountains in Russia in 1830, and was named after Alexander II. Other sources now include Sri Lanka, Burma, Brazil, Zimbabwe, Madagascar and North America. The important feature of Alexandrite which makes it highly unusual and collectable amongst gemstones is its strong colour change when viewed in different lights. Many other stones show a similar property, but nowhere as strongly, and not with such highly contrasting colours. It is hardly ever seen in the U.K. because of its rarity and high price.

Color
Atlanta Alexandrites | Chrysoberyl is mainly green, yellow or brown. High quality alexandrite varies from grass green to raspberry red, although some stones will tend towards olive green or brown, and others to yellow. The red and green colouration is caused by the partial replacement of aluminium by chromium. In daylight, stones appear green, whilst in tungsten lighting they will change color to red. This effect is caused by a combination of factors. Alexandrite is bi-refringent (doubly refractive), and bi-axial, so that it possesses three different refractive indexes in its three different optical directions. Each of these three directions has a strongly different absorption spectrum, causing different colours to be seen when viewed from different directions in relation to the crystal structure, an effect known as pleochroism. Daylight contains high proportions of blue light, tungsten lighting contains a higher balance of red light. The two main optical directions of alexandrite absorb light of different wavelengths in considerably different ways. If this sounds technical and complicated, it is because it is technical and complicated. I will try to return to this paragraph later when I have worked out a simpler sounding way to explain the phenomenon. Any suggestions welcome.

Simulants
Alexandrites in Atlanta | There are many synthetic alexandrites in the market place. Many simulated alexandrites have been produced, usually made of synthetic corundum, occasionally synthetic spinel. A Japanese company also markets a synthetic alexandrite. Many of the simulants are quite large, 10 to 20mm , and are often set in 9ct gold dress rings. If real they would weigh about 5 to 10 carats each, and would be worth a great deal of money.

Genuine (natural) alexandrites are so rare that many jewelers live a lifetime and never see one.

Technical Characteristics

Chemical Composition: BeAl2O4 - Beryllium Aluminium Oxide
Hardness: 8.5
Specific Gravity: 3.71 - 3.72
Refractive Index (R.I.): 1.745 - 1.757
Bi-refringence: 0.008 - 0.010
Crystal Structure: Rhombic

Loose Alexandrite - The Ross Jewelry Company
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