Alexandrite: The World's Most Magical Color-Changing Gem
A Stone That Changes Colour Before Your Eyes
Alexandrite is one of the most extraordinary and coveted gemstones in existence. In daylight or fluorescent light, it appears a vivid bluish-green. Under incandescent light — a candle, a warm light bulb, or a lamp — the very same stone transforms to a rich purplish-red. This remarkable colour change phenomenon has captivated gem lovers since the stone was first discovered in 1830. At Corelune Jewellery, we find alexandrite endlessly fascinating.
The Science of Colour Change
Alexandrite is a variety of chrysoberyl coloured by trace amounts of chromium. Chromium absorbs light differently depending on the spectral composition of the light source. In daylight (which is rich in blue and green wavelengths), the stone transmits green. Under incandescent light (rich in red and yellow wavelengths), the stone transmits red. The result is a gem that appears to be two entirely different colours.
Where Does Alexandrite Come From?
The finest alexandrite was originally discovered in the Ural Mountains of Russia in 1830, supposedly on the birthday of Tsar Alexander II — hence its name. Russian alexandrite is now extraordinarily rare and commands astronomical prices. Other sources include Sri Lanka, Brazil, India, Madagascar, and East Africa. Brazilian alexandrite is considered the best alternative to Russian stones for colour change quality.
Natural vs Lab-Created Alexandrite
Natural alexandrite is exceptionally rare and expensive — fine specimens are worth more per carat than fine diamonds. Lab-created alexandrite shows the same colour change phenomenon and is chemically identical to natural alexandrite but is available at a fraction of the price. Many jewellers sell synthetic alexandrite as the natural version — always ask your jeweller to clarify.
Alexandrite Quality Factors
The strength and quality of the colour change is the primary value driver. The finest stones show a complete transformation from vivid green to vivid red. Stones with weak colour change, brownish or greyish tones, or poor clarity are significantly less valuable.
Explore rare and unusual gemstones at Corelune Jewellery — our team can source exceptional stones for bespoke commissions.
