Thousands of gold. According to the information of official website of Kaiheng Jewelry, "kh" stands for the brand of Kaiheng Jewelry, and 999.9 means that the gold content of pure gold is 99.99%, which is what people often say. Gold ornaments can be divided into pure gold and k gold according to their gold content. The gold content of pure gold jewelry is above 99%, and the highest can reach 999.9%, so it is also called "99 gold", "all gold" and "red gold".