Gold can be exchanged for the same kind three days after it is sold, which means four 9s and five 9s. Five nines and four nines of gold, five nines of gold is high-purity gold with a gold content of 99.999%, and four nines of gold is 99.99%. In fact, there is not much difference in essence. Now more than three nines are collectively referred to as pure gold. When you go to the jewelry store to exchange your old gold, there are different ways. Usually, there are two methods. One is to exchange by weight, that is, to exchange grams with grams. For example, if you exchange 5 grams for his 5 grams, 5 grams of old gold will cost more than 30 yuan a gram of depreciation. Some stores will require at least 3 grams. Another way to change money is to change it into cash, and then choose a gold jewelry with a price and directly exchange the price for the price.