What is 685 gold marking mean?

The "685" gold marking indicates that the item is made of 68.5% gold, which corresponds to 16.4 karats. This marking signifies the purity of the gold used in the jewelry or item, indicating that it is of a high quality but not pure gold (which would be 24 karats). Items marked with "685" are often found in various types of jewelry, including rings, necklaces, and bracelets.