CADINGEMS 1741.05CT LARGE CRYSTALS OF ALEXANDRITE ON MATRIX FROM CARNAIBA
Product – Alexandrite
Weight – 1741.05ct
Size of the biggest crystal – 20.97mm x 13.31mm
Total Size – 102.51mm x 56.09mm x 30.14mm
Shape – Natural
Clarity – Translucent-Opaque
Color - Grey, black, greenish black and dark reddish violet.
Origin – Carnaiba, Bahia, Brazil
Treatment – None/ 100% Natural
Item Code – Q66
ALEXANDRITE by Elena Andia :
It is said that Alexandrite was named after the Russian tsar, Alexander II (1818 – 1881). Legends claim that the discovery of alexandrite was made on the very day the future tsar of Russia became of age. Inevitably, the red and green color change stone was to be declared the official gemstone of Imperial Russia’s Tsardom.
Alexandrite is an extremely rare color change variety of chrysoberyl. Its effect is the phenomenon of an observed color change from greenish to reddish with a change in source illumination. Alexandrite results from small scale replacement of aluminium by chromium ions (Cr3+) in the crystal structure, which causes intense absorption of light over a narrow range of wavelengths in the yellow region (580 nm) of the visible light spectrum. Because human vision is more sensitive to light in the green spectrum and the red spectrum, alexandrite appears greenish in daylight where a full spectrum of visible light is present and reddish in incandescent light which emits less green and blue spectrum. Therefore, Alexandrite is red, violet, purplish red, orangey or brownish red in incandescent
light and green, blue – green to pale green, yellowish green or brownish green in daylight or fluorescent light. Brazilian Alexandrite is known to be highly saturated and exhibits a blue to purplish color change.
Alexandrite exhibiting chatoyancy or the cat’s eye effect is also known, but quite rare. When certain types of long, thin inclusions are oriented parallel to each other, they can create an additional phenomenon called chatoyancy, or the cat’s-eye effect, increasing the alexandrite value.
The main sources of Alexandrite are Brazil (Bahia, Minas Gerais i Goiás), Russia (Ural Mountains), Sri Lanka, Myanmar (Mogok), Tanzania, Zimbabwe, the USA (New Mexico), India, Madagascar, etc.
*This is only a gemological and mineralogical description and not from the item sold on this site. The author of this text does not assume any responsibility of its use.