It is often said that pure gold and silver are soft. There are two different ways of getting around this. The most common way is to alloy it, or add other metals to it, and in doing so, 22k gold, 18k gold, or 925 silver is produced.
However, we prefer to work harden our metals. This lengthy process of milling, stretching, and hammering maintains the purity of gold and silver, while producing strong, hard 24k gold or 999 silver.