How is the color of pearls formed ? The formation of pearl color is a complex process, mainly influenced by internal and external factors. The details are as follows:
Internal factors
Coloration by metal ions: The content of trace metal elements varies slightly in pearls of different colors. For example, elements such as copper, titanium, and vanadium can make pearls yellow or orange, while magnesium, iron, and zinc can make them purple.
Coloration by organic substances: The main coloring factors are organic substances such as porphyrin and carotenoid. The amount of these substances affects the depth of the pearl's color.
Crystal structure and arrangement: The crystallinity of the nacre layer, the orderliness of the crystal structure arrangement, and the thickness of the keratin membrane are the main factors determining the intensity and brightness of the pearl's luster, and also affect the transparency and color of the pearl. When light shines on the surface of a pearl, part of the light is reflected by the surface to form the luster, and another part of the light penetrates the nacre and interacts with the tiny crystal structures inside. For example, white pearls are formed by the uniform scattering of light of all wavelengths in the nacre, while colored pearls such as pink and blue are the result of the selective scattering of light of specific wavelengths.
Thickness of the nacre layer: A thicker nacre layer makes the path of light inside the pearl longer, increasing the light interference effect and making the pearl show a richer range of colors. A thinner nacre layer may make the color appear lighter and less intense, with relatively lower color richness.
External factors
Species of mother shell: Different species of mother shells can produce pearls of different colors. For example, the mother shell of Tahitian black pearls can secrete black nacre, thus forming black pearls. The mother shell of freshwater pearls usually produces white, pink, or orange pearls, while the mother shell of seawater pearls may produce gray, black, or golden pearls.
Cultivation environment: Trace elements in the water, the degree of pollution, pH, etc., can all affect the color of pearls. In waters rich in trace elements, pearls may have more diverse colors. For example, in the South China Sea area, the water is clear and rich in trace elements, so South China Sea pearls have more diverse colors.
Influence of foreign substances: During the formation process of pearls, if there are other substances such as shell fragments, they can also affect the color of pearls. For example, AKOYA gray-blue pearls sometimes appear to have a bluish color because of the foreign substances that penetrate through the nacre layer.
In addition, human intervention can also affect the color of pearls. For example, adding different pigments during the cultivation process may cultivate pearls of specific colors. After harvesting, processing such as dyeing and irradiation of pearls can also change their colors.
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