Talk:Alexandrite/@comment-24253146-20150825125415/@comment-28584561-20150825130525

That is a common misunderstanding. Alexandrites do not change colors during night time or day time (well, they do; but not for the reasons you're thinking). The light shining on an alexandrite stone determines its color. Natural light from the sun that hits earth is mostly composed of greens and blues, and can color an alexandrite green. Incandescent light (light produced by a heated body) can give an alexandrite stone a red color. Light from the sunset, incandescent bulbs, or candle lights are a few. If you shine white light an alexandrite stone at night it'll appear green. It really doesn't matter what time of day it is. It is the source of light an alexandrite gem is shown under that determines its color.