The term refers to a specific type of jewelry construction. It comprises a base metal, typically brass or copper, mechanically bonded with a layer of gold alloy. This layer must constitute at least 5% of the item’s total weight and is often expressed as a fraction, such as 1/20th 14k. For instance, a piece marked “1/20 14K Gold Filled” indicates that one-twentieth of the item’s weight is 14 karat gold. This method differs significantly from gold plating, which involves a much thinner layer of gold applied through an electroplating process.
This manufacturing technique offers a balance between cost and quality. It provides a durable, tarnish-resistant outer layer of gold, offering an appearance similar to solid gold at a more accessible price point. Historically, it gained popularity as a more affordable alternative to solid gold jewelry, allowing a wider audience to access aesthetically pleasing and long-lasting pieces. The substantial gold layer ensures greater durability and resistance to wear compared to plated items, making it a favored choice for frequently worn jewelry items like rings and bracelets.