Outside of just very simple purity hallmarks (i.e. 10k, 14k, 18k, etc.) there are some other varieties of markings that jewelers also use when hallmarking gold jewellery which incorporate letters such as GF, EP, and KP. Beneath is an explanation of a couple of of the most prevalent that you may arrive throughout which would have a direct result on the market place value of your items.
GF - stands for "Gold Stuffed", also identified as "Rolled Gold" or "Rolled Gold Plate" and is composed of a stable layer of Au (or a gold alloy) bonded with warmth and tension to a base steel this kind of as brass. Most substantial top quality gold stuffed parts have the similar appearance as fourteen karat (fifty eight%) gold. In the U.S. the high-quality of gold filled is defined by the Federal Trade Commission. If the gold layer is 10k fineness the minimum amount layer of karat gold in an item stamped GF ought to equivalent at the very least one/10 the complete body weight of the item. If the gold layer is 12k or higher the minimal layer of karat gold in an item stamped GF ought to equivalent at least 1/twenty the complete weight of the product. one/twenty 12k GF and one/20 14k GF are the most widespread stamps identified on gold-filled jewelry, 1/ten 10k is also rather popular.
"Double clad" gold loaded sheet is made with 1/2 the thickness of gold on each facet. 1/20 14kt double clad gold-crammed has a layer on every side of one/fortieth 14k, generating the full content of gold one/twenty of the whole body weight of the product.
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The thinner layer on each side does not don as nicely as one clad gold-crammed.
The Federal Trade Commission will allow the use of "Rolled Gold Plate" or "R.G.P." on merchandise with a reduced thickness of gold than are required for "gold-crammed." one/sixty 12k RGP designates a 12k gold layer that is one/60 of the overall bodyweight of the item. This decreased quality does not put on as effectively as gold-loaded products.
Gold-crammed merchandise, even with day-to-day have on, can very last five to 30 years but will inevitably have on by way of. The gold layer on gold-plated jewellery differs significantly based on the producer, so there is no single, straightforward comparison. Gold-filled things are fifty to 100,000 instances thicker than typical gold plating, and 17 to twenty five,000 instances thicker than heavy gold electroplate (in some cases stamped HGE or HGP which is usually observed on merchandise this kind of as flashy cubic zirconia "cocktail rings").
EP - stands for "electroplating" and is used to make items out of non-precious metals which are then coated in a incredibly slender layer of pure gold by the system of electroplating. Federal requirements need goods that are stamped "EP" to have a thickness of at the very least 7 millionths of an inch of at least 10K gold. Gold electroplated products will have a much lesser total of precise gold material as when compared to "gold stuffed" objects and hence have a substantially decreased benefit (in regards to pure gold information).