jewelry, it’s an immediate indication the item is fake. if this 925 mark is not included on your alleged Tiffany & Co. One sterling silver hallmark of particular note is the 925 stamp used by Tiffany & Co. Therefore when it comes to silver hallmarks, silver is measured by its fineness and marked accordingly. While silver is pure, sterling silver is an alloy of pure silver and another metal. In the system of Greek numerals, it stands for the number 800. It still stands for 'o' in Modern Greek, but there is no longer a difference between long and short vowels, so it sounds the same as Omicron. It stood for a long 'o' sound in Ancient Greek. The fineness hallmarks for platinum are as follows: Omega (uppercase/lowercase ) is the 24th and the last letter of the Greek alphabet. Instead, it is measured by its purity percentage. But, unlike gold, platinum is not measured in karats. Just like gold, platinum is measured by its fineness. To simplify the other commonly used gold hallmarks, here is a handy chart of the caratage hallmarks and the gold purity they correspond to: As we move down the scale of gold purity, 20 karat gold is stamped as 833 to represent the 20:24 (or. Pure gold is 24 karats and is stamped as 999 to indicate its higher gold to alloy ratio. Hallmarks connote the purity or fineness of the precious metals. On most quality jewelry, the specifications of your jewelry (like gold karat) will appear as a hallmark, or a stamp (or several) on the back or underside of the piece. The Greek alphabet has been used to write the Greek language since the late 9th or early 8th century BCE. These numbers, especially karats, are important to understand when examining jewelry for authenticity and to recognize the specifications of your jewelry. While 24 karat or 24K gold is pure gold, 18 karat gold is 18 parts gold, 6 parts alloy metal-or, differently said, 75% pure gold. Gold jewelry is most commonly an alloy metal or a mixture of pure gold and a second, bonding metal. A carat equals 200 milligrams.Ī karat, meanwhile, is a unit measuring the purity of gold. To clarify two frequently used terms: a carat refers to the weight of a stone and is used to describe diamonds or gemstones. What is the difference between carat and karat? To help you understand these important stamps or jewelry hallmarks– and understand which metals are fine, pure, and worth the higher price tag– we outlined the most frequently used hallmarks. When buying or examining jewelry, oftentimes there are a lot of markings on the back of the pieces.
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