On the left, it shows a dark crimson color in the evening, under incandescent light. A natural alexandrite from the Ural Mountains of Russia. Blue-greens and purplish or brownish reds hold less value. Thus, the most valuable gems would have a 100% color shift from pure green to pure red. Alexandrites can exhibit everything from 100% to just 5% color change. Second, the more distinct the color change, the higher the value. First, the closer the colors to pure green and red, the higher the value. Alexandrites have two primary value drivers.
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