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The "290" marking on jewelry typically indicates the metal's purity, specifically referring to a 29% gold content, which translates to 7 karats. This marking is less common than higher karat golds, such as 10K or 14K, which contain more gold. It's important to verify the context of the marking, as it can also be part of a manufacturer's code or a specific design series. Always consult with a jeweler for accurate identification.

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4mo ago

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