Beyond just basic pureness trademarks (i.e. 10k, 14k, 18k, and so on) there are some other types of markings that jewelry experts likewise make use of when hallmarking gold jewelry which include letters such as GF, EP, as well as KP. Below is an explanation of a few of the most usual that you might discover which would certainly have a straight result on the marketplace worth of your products.
GF – stands for “Gold Filled”, also called “Rolled Gold” or “Rolled Gold Plate” as well as is composed of a solid layer of Au (or a gold alloy) adhered with warmth and also pressure to a base metal such as brass. The majority of premium quality gold filled up items have the same appearance as 14 karat (58%) gold. In the United States the quality of gold loaded is defined by the Federal Trade Compensation. If the gold layer is 10k excellence the minimum layer of karat gold in a thing stamped GF should amount to at the very least 1/10 the complete weight of the item. If the gold layer is 12k or greater the minimum layer of karat gold in a thing stamped GF should equal at least 1/20 the total weight of the item. 1/20 12k GF as well as 1/20 14k GF are the most usual stamps found on gold-filled precious jewelry, 1/10 10k is likewise relatively common.
“Double clothed” gold loaded sheet is produced with 1/2 the thickness of gold on each side. 1/20 14kt double attired gold-filled has a layer on each side of 1/40th 14k, making the total material of gold 1/20 of the total weight of the thing. The thinner layer on each side does not wear as well as solitary clad gold-filled.
The Federal Trade Payment enables the usage of “Rolled Gold Plate” or “R.G.P.” on things with a reduced density of gold compared to are required for “gold-filled.” 1/60 12k RGP designates a 12k gold layer that is 1/60 of the complete weight of the product. This lower high quality does not wear as well as gold-filled products.
Gold-filled things, even with day-to-day wear, could last 5 to Thirty Years however will at some point wear via. The gold layer on gold-plated precious jewelry varies substantially depending upon the producer, so there is no single, easy comparison. Gold-filled things are 50 to 100,000 times thicker than normal gold plating, and also 17 to 25,000 times thicker than heavy gold electroplate (sometimes stamped HGE or HGP which is commonly located on products such as fancy cubic zirconia “alcoholic drink rings”).
EP – represent “electroplating” and is made use of making things from non-precious metals which are after that covered in an extremely thin layer of pure gold by the process of electroplating machine. Federal criteria require items that are stamped “EP” to have a thickness of a minimum of 7 millionths of an inch of at least 10K gold. Gold electroplated items will certainly have a much smaller quantity of actual gold content as compared to “gold filled” items as well as consequently have a much lower value (in relation to pure gold web content).
KP – stands for “karat plumb” that’s “plumb” as in “straight” or “specific”, so 14kp gold is precisely 58.555% gold. This noting associates with some odd, and currently outdated United States legislations. 14 karat indicates that a thing is 14/24 gold with the rest being other metals. The trouble has the rounding. 13.88/ 24 would be rounded to 14k under the old United States law as well as 13k under matching British law. Certainly, this might trigger some confusion, specifically for United States manufacturers that want to market in Europe. European customers just didn’t believe the marks were exact. They began making use of the mark 14kp to imply that it goes to least 14.00/ 24 parts gold. The guidelines have in fact altered to where US makers are utilizing the same policies as the remainder of the world but the 14kp system of naming still survives. For new pieces, 14k as well as 14kp both mean that it goes to the very least 14.00/ 24 parts gold. In older items 14k may consist of just 13.51/ 24.
“KP” is often incorrectly thought by individuals to suggest “karat PLATE.” If the gold item is just “plated” it will commonly be marked with the pureness of the gold alloy that it is plated with adhered to by the letters General Practitioner (gold plate), GF (gold filled), or EP (electroplated). Instance: 14k General Practitioner or 1/20 14k GF.