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When the economy is good, the overall jewelry market will expand accordingly, but when the economy is bad, the jewelry market will not decline accordingly. Some people used to say that the market was chaotic. However, there are more and more people who don't fully understand the economy in today's society, and the world is getting more and more flat. Therefore, many people who know jewelry regard high-grade jewelry as a tool to preserve the value of coins (the most important thing is that it not only has poor preservation, but also has great appreciation). Of course, this is also the historical development to this day.

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