Zhou Dasheng’s diamond ring, must you change to 1,000 yuan higher than the original ring when changing money? Is this the store’s regulations or the manufacturer?

Do Zhou Dasheng’s manufacturers must be provided like this? Why is there such a thing? When they bought it at the time, they didn’t say it, that is to say, they could exchange money. As a result, when I went to exchange money 1,000 yuan can only be 1,000 yuan