Known in Russia as the "gem of the tsars," alexandrite is truly a miraculous gemstone. Often described as an "emerald by day" and "ruby by night," alexandrite shows a teal to forest green when viewed under sunlight or fluorescent lighting. However, when seen by candlelight, it appears violet, crimson red, raspberry, purple or orange.

Chromium causes alexandrite's color change and is very rarely found in nature. The unlikelihood of it being in the right place to combine with aluminum and beryllium under the right conditions makes alexandrite rare and valuable.