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What kind of jewelry is Gu Hai?
Precious purple gems.

Gu Hai is an extremely rare purple mineral, also known as Gu Hai amethyst or purple gem. This jewelry material is formed by calcium ions and iron ions in calcium. In the ancient jewelry culture, Gu Hai is regarded as one of the important representative works, which can be traced back to the Shang Dynasty and has existed for thousands of years.