What is the cause of the green color of emeralds? Emerald is known as the king of emeralds, a very precious gemstone (the birthstone of May), one of the four precious stones (red, blue, emerald and diamond) recognized by the international jewelry industry.
The emerald green comes from the chrome ions inside it, which can be observed by Charles filter.
Under the Charles filter, most of the emeralds appear dark red due to the presence of chromium ions, while other green substitutes are mostly dark green. This rule can only be used as a reference for identification. It cannot be used to determine the authenticity, because some African-made emeralds are not red under the color filter. On the contrary, some artificial emeralds have a strong red color.
The green color of emeralds is not the same as the color of other natural emeralds, and its rich inclusions can be distinguished by more experienced people.
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