What does the COP marking inside some jewelry stand for?

often, it means the core material is copper, and has a plating of gold or silver over it, usually gold.

The COP marking inside some jewelry stands for "Copyright" or "©." It signifies that the design of the jewelry piece is protected by copyright law. This marking indicates that the design is an original creation and cannot be reproduced or used without permission from the copyright holder.

To find this information, you can examine the jewelry piece closely. Look for any tiny engravings or markings on the inner side of the jewelry, such as the band of a ring or the back of a pendant. A magnifying glass or a jeweler's loupe might help you see those markings more clearly. If you spot the word "COP" or the copyright symbol "©," that means the jewelry item is copyright protected.