What does chr mean on a gold bracelet?

"chr" on a gold bracelet likely stands for "carat," a unit of measurement used to indicate the purity of gold. Pure gold is 24 carats, but gold jewelry is often made with a lower carat value to increase durability. For example, 18-carat gold is 75% gold and 25% other metals. The carat value is typically stamped on gold jewelry to indicate its purity level.