Why does alexandrite appear to change color in sunlight and artificial light?

It has been determined that the absorption spectrum of all alexandrite-like minerals is characterized by transmission maximumin the blue-green and red regions and by a transmission minimum in the yellow region. The color of minerals with two such regions of transmission is determined in daylight (richer in blue and green) by the position of the transmission maxima and in incandescent light (richer in red) by the ratio of transmission in the red and transmission in the blue-violet sections of the visible spectrum.

How much will a one carat alexandrite gemstone cost?

The retail replacement cost for an average quality 1ct. alexandrite could be anywhere between USD $1000 to USD $20,000 per ct. The intensity of the color change and the attractiveness of the colors is the most important factor in determining the value of an alexandrite. The cut, clarity, and weight are also critical factors. As recently as 2005, an alexandrite stone was sold for nearly $100,000 per carat!

Is alexandrite the most expensive gemstone in the world?

In 1 ct. sizes, top quality alexandrites are among the most expensive gemstones in the world surpassing rubies andemeralds. Top quality alexandrite will earn a higher premium than fine diamonds, or nearly any other gemstone. In short, yes.

Why is natural alexandrite better than synthetic alexandrite?

Natural alexandrite is not necessarily “better” than synthetic alexandrite, but natural is far more rare and valuable. There are several manufacturers of synthetic alexandrite, and production of large stones does not seem to be limited by any factors other than capital investment in the growing operation. Natural alexandrite production, however, is at the mercy of what nature yields, not what is possible in a laboratory.

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