AMCO is the company that manufactured the piece of jewelry. The 14K represents the carat weight of the gold. The GF stands for gold filled. AMCO went out of business in 1970.
The "14k gf" stamp on a gold chain indicates that the piece is made of a base metal that is bonded with a layer of gold. "14k" refers to the gold's purity, meaning it contains 58.3% gold, while "gf" stands for "gold filled," indicating that the gold layer is significantly thicker than gold plating and is mechanically bonded to the base metal. This makes gold-filled jewelry more durable and longer-lasting than standard gold-plated items.
"14k gf esp" typically refers to jewelry made of 14-karat gold filled (gf) material, indicating that it has a layer of 14k gold bonded to a base metal. The "esp" could stand for "especially" or might be an abbreviation specific to a brand or style. Gold-filled jewelry is known for its durability and is a popular choice for affordable yet high-quality pieces.
In the U.S., solid gold jewelry is marked with the purity and the hallmark (trademark) of the maker. So, for example, my wedding ring is marked "14K FG" which means it is 14 karat gold, made by Frederick Goldman, Inc. The maker's hallmark can usually be found by searching the US Patent and Trademark Office's trademark database (but the search will probably be tedious).There is, however, an exception, and that is that "GF" is the standard abbreviation for "gold filled" which means it is a cheaper metal core coated with gold on the outside. In other words, it is not solid gold. It would be simply crazy for any jewelry maker to select the hallmark "GF" when that normally mean that it is not solid gold, so you can expect that anything marked "14K GF" is not solid gold, although it should also have an indication of the gold content, e.g. "1/20 14K GF" would mean that the gold coating is 14 karat gold, and is 1/20th of the total weight.
In the U.S., solid gold jewelry is marked with the purity and the hallmark (trademark) of the maker. So, for example, my wedding ring is marked "14K FG" which means it is 14 karat gold, made by Frederick Goldman, Inc. The maker's hallmark can usually be found by searching the US Patent and Trademark Office's trademark database (but the search will probably be tedious).There is, however, an exception, and that is that "GF" is the standard abbreviation for "gold filled" which means it is a cheaper metal core coated with gold on the outside. In other words, it is not solid gold. It would be simply crazy for any jewelry maker to select the hallmark "GF" when that normally mean that it is not solid gold, so you can expect that anything marked "14K GF" is not solid gold, although it should also have an indication of the gold content, e.g. "1/20 14K GF" would mean that the gold coating is 14 karat gold, and is 1/20th of the total weight.
"14k gf" stands for 14-karat gold filled, which indicates that a piece of jewelry has a layer of 14k gold bonded to a base metal, typically through a heat and pressure process. This means that the gold layer is thicker and more durable than gold plating, providing better longevity and resistance to tarnishing. Gold filled items are a more affordable option compared to solid gold, while still offering a similar appearance.
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