Cubic zirconia are synthetic diamonds, created in a laboratory. Zircons are the world's oldest mineral. Years ago, they were used as a substitute for diamonds because they have similar refractive and dispersion qualities. But they're beautiful stones on their own, and they can be turned into stunning custom jewelry.Because of the way zircons were formed, they have two properties that make them interesting as gemstones. First, their color can seem to change depending on the way light strikes them -- jewelers call that pleochroism -- and they can split light so that it travels in two slightly different...
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