Some common jewelry marks are metal stamps, which indicate the purity of the metal used in a piece of jewelry, and manufacturer or designer logos. Jewelry marks are used to provide information about pieces of jewelry.
Typically, the most important jewelry mark is the metal stamp. This identifies what kinds of metals are used in a piece of jewelry as well as the weight. A common metal stamp is "14k," which stands for "14-karat gold."
Another common mark is the name of the manufacturer, jeweler or designer. For example, a piece of jewelry designed by famous designer David Yurman is stamped "© D.Y." Jewelry marks also indicate if pieces of jewelry use trademarked gems. For example, a ring studded with a Hearts On Fire diamond would have a "HOF" stamp.