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They appeared to be inclusion-free and under a strong incandescent light in the long direction, asterism could be seen with two rays weaker than the eye. The second aspect of color is how close the stone is to true green and red. Most desirable alexandrite is transparent but may have inclusions that appear under magnification as small spots or fine threads. But it's important to note that many of the newly found gems are not as vividly colored as the Russian gemstones and do not change color as dramatically. Less desirable alexandrite found today may be translucent or opaque. It has been used for healing inner ear problems, clearing the lymph system, and for disorders related to the blood and circulatory system in general. There have been many examples of these simulants found in older rings passed off as alexandrite that proved in actuality, to be doped glass.
Some pulled stones have been seen to change color from blue to red – similar to natural alexandrite from Brazil, Madagascar, and India. Red and green were Imperial Russia's national colors, increasing demand for the gemstone and eventually depleting the supply found in the Urals. Other times, alexandrite simulants are made of glass, doped glass, plastic, and other compounds. The eye was broad and of moderate intensity. Under magnification, parallel striations could be seen along the length of the cabochon and the striations were undulating rather than straight, again not a feature of natural alexandrite.Czochralski or “pulled” alexandrite is easier to identify because it is very “clean”.
Curved striations visible with magnification are a give-away. They have “tadpole” inclusions (with long tails) and spherical bubbles. This blue to purple color change more likely indicates a hydrothermal lab-grown alexandrite. The more predominant the color change, the more valuable. Oval Faceted Weak Color change $89.00 59.65 Ct Excellent Color-Change Alexandrite AAA+ Quality Fancy Cut AGSL Gemstone You can clean them mechanically, per the instructions of the system used.
Specimens were a dark greyish-green with slightly purple overtones under fluorescent lighting.
These gems have no special care requirements. Find out how to assess alexandrite by first learning all the basics.Alexandrite was first discovered in the 1830s in Russia's Ural Mountains and named after the future Czar of Russia, Alexander II. The stone has the same physical and chemical properties as a natural alexandrite. It's Specific Gravity 3.71 to 3.72 and Refractive Index is 1.745.
Alexandrite is rated at 8.5 on the Mohs scale, between diamond at 10 (the hardest gem) and corundum (sapphire and ruby) at 9. Alexandrite Gemstone is a rare variety of the mineral Chrysoberyl & is a strongly pleochroic gem. Follow cleaning instructions from the jewelry store or individual who sold you the jewelry.There are two critical components to a valuable alexandrite stone: size and color. The mineral or gemstone chrysoberyl is an aluminate of beryllium with the formula BeAl2O4. The fascinating history and lore make the alexandrite stone one of the most desired on the market. Color-changing alexandrite is nature’s magic trick. Alexandrite Lab Created Chrysoberyl 7x9 MM. Alexandrite’s refractive index is somewhere between 1.741-1.760, corundum’s is between 1.759 and 1.778. Gems from areas in Brazil exhibit better color changes than stones from other areas and are in most demand, but their colors differ somewhat from the Russian gems.Consider obtaining a gem report to reveal a stone's true origins before spending a large amount of money on alexandrite that's advertised as natural.Alexandrite has been used for crystal healing since its discovery. Despite the similarity of their names, chrysoberyl and beryl are two completely different gemstones, although they both contain beryllium.
First, you must consider how dramatic the color change effect is.