mygemologists.com

With the transparent chrysoberyl, the depth of color is most important. Size is also a great factor in determining value, for specimens of five carats and over are not common. The more valuable variety is the alexandrite, and such sizes of this diamond  rings stone, if of good quality, would easily reach $280 (£100) a carat. But the chief property which they must possess is their ability to change their colors distinctly in natural and artificial lights. The twin colors should be greenish (but not too dark a green) in ordinary light, and a raspberry red or a purplish red by artificial light. These twin colors are sometimes seen in ordinary light alone, Small stones of about one carat do not realize a high price—per haps $28 (£10) to $70 (£25) a carat. It is size and color changt which make this stone valuable, and such specimens are very rare and consequently in constant demand.

Aquamarines are a popular stone, but good blue specimens attain a price which preclude their sale in medium priced jewelry. The depth of blue should be carefully considered, for shades vary considerably, and the very pale stones diamond eternity rings have almost no value. If possible, specimens of different qualities should be compared for shade, since aquamarines range from almost the white to the deep, transparent blue.

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