Labradorite is the most popular and interesting plagioclase gem. This feldspar sometimes occurs in transparent yellow crystals from which . tones can be faceted. More commonly it forms crystalline mases extensive internal twinning that produces many thin layers.

Light interference from these layers produces a sheen or glow that across the entire stone. Sometimes the color is uniform over a large area, or it may break up into patches of different colors.

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The, colors include blue, blue-green, green, yellow, and gold. Spectacular labradorite comes from Labrador, the U.S.S.R., and Canada. Consumer Tips-Fine moonstone is not common, especially material displaying a blue, well-centered sheen, and fine sunstone is just a¬s scarce. Faceted plagioclase gems are very rare and may vary in price, with size and quality. Maximum prices for any cut feldspar would be , few tens of dollars per carat. With the exception of moonstone, few of the feldspars are used commercially, although they are widely used by hobbyists.