Color Zoning
Uneven distribution of color within a gemstone, often in distinct bands or patches reflecting growth stages. Visible color zoning can reduce a gem's value; it is common in sapphire, amethyst, and tourmaline.
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Gemology
Uneven distribution of color within a gemstone, often in distinct bands or patches reflecting growth stages. Visible color zoning can reduce a gem's value; it is common in sapphire, amethyst, and tourmaline.