It was found that the price of Chow Sang Sang's pure gold jewelry has reached 991 yuan per gram, an increase of nearly 80 yuan in just four days compared to 912 yuan per gram on April 7. The price of Lao Miao's pure gold jewelry has also risen to 983 yuan per gram, up 26 yuan per gram from the previous day's 957 yuan, with a cumulative increase of 53 yuan over two days and 65 yuan over four days