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.
Catégorie:
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.