Chow Tai Fook, Luk Fook Jewelry, BOC Jewelry, China Gold and Gold Jewelry are all exchanged for one gram.

One gram of old gold is exchanged for new gold, and the depreciation expense is calculated according to the depreciation price set by the gold shop. Prices vary from place to place. Generally, it is one gram of 25 yuan (for example, the depreciation fee of old gold, you multiply 2 grams of old gold by 25 equals 50), and the extra grams are bought at the price of new gold.