Pure gold is a hypoallergenic metal and is referred to as 24k gold. Smaller amounts also may be found in Nevada, in the USA. For 18 carat jewellery, 75% gold, 15% silver, 6% copper and only 4% cadmium. Intentional addition of cadmium may enhance the green color, although cadmium is toxic, so this limits the uses of the alloy. The ancient Greeks called it "gold" or "white gold", as opposed to "refined gold". Brassy-colored electrum contains a higher amount of copper. Our R & D department is always working on developing new alloys that have the properties and colors to suit our ever changing industry. Natural electrum ranges in color from pale gold to bright gold, depending on the amount of the element gold present in the alloy. 18K green gold would contain eighteen parts yellow gold and six parts silver. ThoughtCo uses cookies to provide you with a great user experience. The addition of 2% cadmium produces a light green color, while 4% cadmium yields a deep green color. Historical Trivia In 862 BC, the Lydians, an Iron Age kingdom in present-day Turkey, were using coins made of electrum. (750/1000): 75% fine gold + 25% silver In 18 Karat alone we have over 10 different alloys to choose from, so chances are that if you are trying to match a specific color we probably already have it. Thus, electrum was a popular and valued precious metal. For many years fashion designers have been adding green to their creations to help them spring to life. German silver typically consists of 60% copper, 20% nickel and 20% zinc. Green is the color of harmony, renewal, hope and health. 1. If you are looking for a certain shade of green for your jewelry, it is a good chance that we already have it. Electrum Metal Alloy Electrum is a naturally occurring alloy of gold and silver with a small amount of other metals. Silver dissolved in gold creates a green-gold color. The very subtle green tint is created by its silver content. Electrum has been used as currency, to make jewelry and ornaments, for drinking vessels, and as an exterior coating for pyramids and obelisks. Electrum is a naturally occurring alloy of gold and silver with a small amount of other metals. The addition of palladium to gold increases its melting point, modulus of elasticity, strength and hardness. Green gold is an alloy of gold, silver, and sometimes copper. The lower the karat number assigned to a particular alloy the less gold or yellow the alloy will appear. The ratio of gold to silver in natural electrum varies according to its source. Ancient drinking vessels were made of electrum. Read our Environmental Policy or request a compliance letter from one of our suppliers. A lower silver green alloy that has a bright green color. The word electrum has also been applied to the alloy called German silver, although this is an alloy that is silver in color, not elemental composition. White gold is an alloy of gold and at least one white metal (usually nickel, silver, or palladium). **All of our gold is Eco-friendly. Furthermore, before the widespread use of the SS wire, gold alloys were used due to the lack of the availability of other materials that can tolerate the oral conditions. The alloy metals used with gold give it strength so it can be made into beautiful lasting jewelry. Found in the Earth's crust, with trace amounts of copper and other metals, it is termed electrum. Brass & Bronze are both primarily made of copper. Gold alloys were initially used to fabricate archwires because they are inert, biocompatible, and stable. It depends on the alloy mixture, but most alloys contain nickel and copper, both of which commonly cause skin discoloration. All Non-Pure Gold is Made Up of Alloys . Where Does the Color Come From? Electrum was used to make the earliest metal coins, dating back at least to the 3rd millennium BC in Egypt. The purity or fineness of gold in the jewelry is indicated by its karat number—24 karat (24K or 24 kt) gold is as pure as gold gets for jewelry. Log In Definition of green gold : an alloy of 14 to 18 karat gold that is greenish in color and employs either silver or silver plus cadmium or zinc as the alloying metal 14K green gold would contain fourteen parts yellow gold and ten parts silver. White Gold With Nickel, The Most Common Mix The exact properties of electrum depend on the metals in the alloy and their percentage. This low silver green gold contains zinc and therefore should not be hard enamelled. A yellow-green 'green' gold alloy that has a found a niche where cost is a concern. ACI Alloys can arc-cast pure gold sputtering targets and evaporation pellets. For many years fashion designers have been adding green to their creations to help them spring to life. Copper, iron, bismuth, and palladium commonly occur in natural electrum. Almost the limit of 'green' color in 18K alloys, this 'dark green' alloy will provide the deepest coloration in the high karat alloys. The addition of copper will transform it to rose gold, while a blend of copper and white metals will result in green gold. 1. Green gold – relatively rare – is an alloy that usually contains only gold and silver. I alsoremember they said if it was not added correctly it would not work and burnaway or not mix This was 35 years ago so I do not know what percent and at that time my job was rolling and drawing the metal, I did not do the alloying. The other metals that are added to 24K pure gold determine its color. Gold 2. That said, alloyed jewelry items which are rhodium plated will prevent skin discoloration. In the modern world, the primary source of electrum is Anatolia. Most of the alloys consist of gold, silver and a very small amount of copper to slightly improve the hardness. Electrum is harder and more durable than pure gold, plus the techniques for gold refining were not widely known in ancient times. These alloys are widely used in jewellery to give perfect finish and shine. Silver The quintessential green - high silver alloy. In ancient times, the chief source of electrum was Lydia, around the Pactolus River, a tributary of the Hermus, now called the Gediz Nehriin in Turkey.