The gold content of gold 999 is 99.9%, in contrast, the gold content of gold 9 16 is 9 1.6%. This means that the purity of gold 999 is higher, so it is more popular in the market. The industry logo is also different. Gold 999 is usually labeled as G999, AU999 or Gold 999, while gold 9 16 is labeled as G9 16, AU9 16 or gold 9 16.

And the hardness of gold 9 16 is higher than that of gold 999. This means that gold 9 16 is more wear-resistant and more suitable for making jewelry and other items that need to be worn frequently.

From the appearance, the color of gold 999 is brighter yellow with higher gloss, while the color of gold 9 16 is lighter and tends to be light yellow. This difference may affect people's aesthetic preference for gold.

Finally, due to the high purity of gold 999, its market price is usually higher than that of gold 9 16. Investors and collectors usually prefer to buy gold with higher purity because they are considered to have higher value and stability.