Alexandrite

Alexandrite is a rare variety of the mineral chrysoberyl that contains chromium, the same trace element responsible for the colour in rubies and emeralds. The colour-change effect occurs because chromium causes alexandrite to absorb light in a very specific way. In broad-spectrum daylight, the green wavelengths dominate; under the redder spectrum of incandescent light, the red wavelengths become prominent. The strength and completeness of this colour change — from pure green to pure red — determines the stone's value. Fine alexandrite with a strong, complete colour change is extraordinarily rare and commands prices that can exceed fine rubies.

Russian alexandrite from the Ural Mountains, discovered in 1830, remains the benchmark for quality — vivid green to vivid red with a strong, complete change. Sri Lankan alexandrite tends to shift from khaki or olive green to brownish red. Brazilian alexandrite can show excellent colour change but in different hue combinations. Cat's-eye alexandrite (chatoyancy combined with colour change) is doubly rare and highly valuable.

Alexandrite was discovered in Russia's Ural Mountains in 1830 and named after Tsar Alexander II. The stone's red and green colours matched the Russian imperial military colours, making it an instant national treasure. The Russian deposits were largely exhausted by the end of the 19th century, and alexandrite became synonymous with extreme rarity. New deposits in Brazil and Sri Lanka were found in the 20th century, but stones with the classic strong green-to-red change remain extraordinarily rare. Fine alexandrite is one of the most expensive gemstones per carat in the world.

Alexandrite symbolises good fortune, creativity, and imagination. Its dual-colour nature is said to represent the balance between the physical and spiritual worlds. It is associated with adaptability, confidence, and joy. The colour-changing quality is sometimes interpreted as a reminder that perspective changes everything — the same situation can look entirely different depending on the light in which you view it.

Lab-grown alexandrite is chemically identical to natural alexandrite and displays the same colour-change phenomenon. Created using the Czochralski or flux growth methods, lab-grown alexandrite offers the dramatic green-to-red change at a fraction of the cost of natural stones. Given that fine natural alexandrite can cost $10,000-$70,000 per carat, lab-grown versions make this extraordinary gem accessible to a much wider audience. Lab-grown alexandrite is an outstanding choice for those who love the colour-change effect.

Alexandrite's excellent hardness (8.5) makes it durable and easy to care for. Clean with warm soapy water, ultrasonic cleaners, or steam cleaners. Store separately from harder gemstones. Alexandrite is suitable for engagement rings and daily wear. Its colour-change effect is best appreciated by viewing the stone under different light sources — daylight near a window and warm indoor lighting.

Alexandrite makes an extraordinary engagement ring for those who want something truly unique — a ring that literally changes colour throughout the day. Solitaire settings and three-stone designs showcase the colour change beautifully. Alexandrite earrings allow the wearer to see the colour shift as they move between lighting environments. Lab-grown alexandrite makes larger, more vivid stones accessible for statement rings and pendants that would be prohibitively expensive in natural material.