A 750 mark on jewelry means that the metal alloy used to make the jewellery contains 75 percent gold or another precious metal. Most precious metals used in jewelry are alloys because the addition of other metals improves hardness and durability. It also changes the color of the metal.Continue Reading
Gold jewelry with the 750 hallmark consists of 18-karat or 18K gold and bears a European hallmark. In the karat system used in America, pure gold contains 24 karats of gold, so the whole comprises 24 parts.
Replacing six parts with alloy metals yields a purity level of 75 percent. Adding palladium or nickel to yellow gold creates white gold. Adding copper produces rose gold.Learn more about Jewelry & Watches
Identify jewelry markings by the type of precious metal content they symbolize. In the United States, jewelry manufacturers are required to inform the customer of the precious metal content in a piece of jewelry, which they often do by marking the inside of the piece. When using this method, the jewelry maker is required to include its trademark beside the metal content stamp.Full Answer >
White gold, especially in some jewelry pieces, may turn yellow over time when its rhodium plating gradually wears off. Rhodium plating is the preferred plating method used on most white gold rings because it is a pure white metal. This property of rhodium gives white gold jewelry a much whiter appearance and a more brilliant sheen.Full Answer >
To clean tarnished white gold, gather a bowl, mild dish soap, warm water, baking soda, a soft toothbrush, and a microfiber towel or jewelry polishing cloth. Soak the white gold item in soap and water, apply baking soda, rub the gold with a toothbrush, rinse the item, and then dry it. If the tarnish remains, use a professional jewelry cleanser.Full Answer >
The jewelry marks of popular American jewelers include the long oval that encloses Schreiner at the top and New York at the bottom that is the mark of Henry Schreiner. A shorter oval that encloses DeMario is the jeweler's mark for Robert DeMario jewelers.Full Answer >