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Gold jewelry is popularly hallmarked with a three-digit number or a number followed by the letter "K." These numbers mark the fineness of the gold or its karat, respectively. More »

The "495" Hallmark on a piece of gold means that it is 49.5 percent gold and 50.5 percent other metals. This is known as a standard mark, and it shows the purity of the metal as well as its shape. More »

Find a Hallmark store nearby by visiting the Hallmark website and using its Store Finder tool. The tool searches for stores in both the United States and Canada, notes Hallmark. More »

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Gold stamped "925" is probably gold-plated sterling silver. The "925" is part of a precious metals hallmark system, but only silver is denoted "925," or 92.5 percent, pure. More »