999 foot gold means thousand foot gold, and the numerical symbol of gold represents its purity. 999 foot gold represents that it has reached the highest level of jewelry in terms of color, purity, and craftsmanship. And now the national standard only defines 999 thousand foot gold, which means 999 gold is the highest purity gold.
The imprint of 999 foot gold is Qian foot gold, 999 gold, gold999 or g999, among which gold is also expressed by k to indicate its gold content. The common foot gold is 24k, which is 999 foot gold. 999 foot gold has a slightly soft texture and good ductility, and is generally used for making gold jewelry. 999 foot gold jewelry will leave marks if bitten or scratched with nails. And it usually presents a deep reddish yellow color, and there is also a certain "falling sensation" when held in the hand.