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Piercing jewelry is often made of a gold alloy, the most common being 18k, with 24k being entirely pure and much softer. 18k gold usually contains 75% gold and the remaining 25% copper, silver and traces of other metals. In lower quality gold, zinc, nickel and other irritants can also be found.
Nickel silver, maillechort, German silver, [1] argentan, [1] new silver, [1] nickel brass, [2] albata, [3] or alpacca [4] is a cupronickel (copper with nickel) alloy with the addition of zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. [5] Nickel silver does not contain the element silver. It is named for its silvery ...
'Tibetan Silver' includes copper-tin, and copper-nickel alloys; zinc alloys; and other alloy compositions, as well as base metals such as iron plated with a silver alloy. An X-ray fluorescence analysis showed that six of seven items acquired online and described as 'Tibetan silver' were alloys containing primarily copper, nickel, zinc.
The Nickel Directive was a European Union directive regulating the use of nickel in jewellery and other products that come into contact with the skin. Since 1 June 2009, it has been subsumed into the REACH Regulation , specifically item 27 of Annex XVII to that regulation.
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The quality of all coins is not equal and collectors felt the necessity of defining the quality of the coins in order to assess their value. Rim damage, nicks, polishing, cleaning, scratches and other forms of wear are considered factors in grading a coin. Whether or not a coin shows evidence of having been mounted in jewelry also affects its ...
In Professor Ewa Czarnobilska's view (the manager of the research team) the main reason of allergy (listed by allergists) is presence of nickel as a component of alloys used in the production of earrings – however the ingredients declared by producer are not significant, because nickel is a standard component of jewellery.
Electrum was often referred to as "white gold" in ancient times but could be more accurately described as pale gold because it is usually pale yellow or yellowish-white in color. The modern use of the term white gold usually refers to gold alloyed with any one or a combination of nickel, silver, platinum and palladium to produce a silver ...