Gold foot gold refers to gold with a gold content of over 99%, which is a relatively high purity gold.
Foot gold is a common pure system of gold jewelry, with the marks of "foot gold", "990 gold", "gold990", and "g990". There is also a type of thousand foot gold, which has a gold content of not less than 999 per thousand, and is the highest value in jewelry color naming. The imprint of Qianzujin is "Qianzujin", "999 gold", "gold999", "g999". Qianzujin has a higher purity than pure gold, so its resale value is relatively better.
But on the eve of the Spring Festival in 2015, the National Standardization Administration announced the first amendment to the "Regulations and Naming Methods for the Purity of Precious Metals in Jewelry", which came into effect on May 4, 2016. From now on, even gold jewelry with a purity of 999.0 ‰ can only be labeled as "full gold", not "thousand full gold". So the way to determine a thousand foot gold is to look at the marks on the gold jewelry.
