Lab Alexandrite: Laboratory-Grown Chrysoberyl
Appearance & Properties
Lab alexandrite is laboratory-grown chrysoberyl, the same mineral species as natural alexandrite. Its best-known feature is a noticeable colour change: in daylight it may appear green, bluish green or teal, while warm incandescent light can bring out red, raspberry or purplish-red tones. The effect results mainly from chromium, which absorbs selected parts of the visible spectrum. Alexandrite can be transparent to translucent and may also show pleochroism, meaning that its colour varies slightly with viewing direction. Chrysoberyl has a hardness of about 8.5 on the Mohs scale, making it suitable for jewellery, although it can still chip at sharp edges or suffer damage from knocks. Laboratory growth reproduces the relevant chemical and optical properties; it does not make the material naturally mined.
History & Discovery
Natural alexandrite became known in the Russian Urals around the early 1830s, traditionally associated with deposits near the Tokovaya River. Its name is traditionally linked with the future Tsar Alexander II and the imperial context of the period, while the exact naming chronology is not certain. The gem quickly attracted attention because its red-and-green appearance echoed colours associated with imperial Russia. Natural alexandrite is a chromium-bearing variety of chrysoberyl, not a separate mineral species. During the twentieth century, improved laboratory methods made it possible to grow alexandrite-like chrysoberyl, first for technical and research purposes and later for jewellery. Lab alexandrite is therefore a manufactured counterpart, created under controlled conditions rather than recovered from a geological deposit.
Occurrences
The historic Russian Ural localities gave alexandrite its name, but they are no longer the principal commercial source. Important natural material has also been found in Sri Lanka, generally with olive or brownish colour tendencies, and in East Africa, including Tanzania and Zimbabwe. Brazil became especially important after discoveries in Minas Gerais, notably near Hematita, where fine colour-changing stones have been recovered. Natural alexandrite remains uncommon because both attractive colour and a strong, distinct change are difficult to achieve in one crystal. Lab alexandrite is produced in facilities using controlled crystal-growth techniques. The existence of these deposits does not indicate the origin of any individual SwissGemShop stone.
Famous Examples & Interesting Facts
Alexandrite is notable less for a universally famous single specimen than for an optical performance that can make one stone appear to have two identities. Its apparent colours depend strongly on the light source: daylight is relatively rich in blue-green wavelengths, while incandescent light contains more red and yellow. The strength of the change is therefore influenced by the lighting environment, not only by the gem itself. Natural alexandrite is often discussed alongside the “alexandrite effect”, a useful term for this reversible colour shift. Laboratory-grown stones can display the same phenomenon because they contain the relevant chromium-related optical centres, although their inclusions and growth structures may differ from those of natural material.
Jewellery & Use
Lab alexandrite is used in rings, pendants, earrings and especially display pieces where changing illumination can be appreciated. Oval, cushion, round and mixed cuts are common; faceting is chosen to balance colour change, brightness and weight retention. With a Mohs hardness of about 8.5, chrysoberyl is durable for regular jewellery wear, but a ring still deserves sensible protection from hard impacts, sharp knocks and abrasive surfaces. Clean with lukewarm water, mild soap and a soft brush, then rinse and dry carefully. Avoid sudden temperature changes and harsh chemicals. Ultrasonic or steam cleaning should be used only after a professional has assessed the stone and setting. “Lab-grown” describes origin; it does not by itself specify treatment or guarantee a particular optical quality.
Symbolism, Astrology & Tradition
Alexandrite is commonly presented in modern jewellery traditions as an alternative birthstone for June, alongside pearl and moonstone; birthstone lists vary by organisation and country. Its green-to-red change has inspired symbolism involving transformation, adaptability and balance, but these are cultural associations rather than scientific properties. In Russian historical lore, the stone’s colours were sometimes connected with national or imperial symbolism. Some contemporary crystal and esoteric practices assign alexandrite meanings such as intuition, renewal or emotional harmony. These are beliefs and symbolic interpretations, not established medical, psychological or astrological effects. Astrology associations also vary, and there is no scientific evidence that alexandrite changes health, personality or destiny.