Jewellery

タイトルまたは説明

In creating jewellery, gemstones, coins, or other precious items are often used, and they are typically set into precious metals. Alloys of nearly every metal known have been encountered in jewellery. Bronze, for example, was common in Roman times. Modern fine jewellery usually includes gold, white gold, platinum, palladium, titanium, or silver. Most American and European gold jewellery is made of an alloy of gold, the purity of which is stated in karats, indicated by a number followed by the letter K. American gold jewellery must be of at least *0K purity (*1.7% pure gold), (though in the UK the number is 9K (*7.5% pure gold) and is typically found up to *8K (*5% pure gold). Higher purity levels are less common with alloys at *2 K (*1.6% pure gold), and *4 K (*9.9% pure gold) being considered too soft for jewellery use in America and Europe. These high purity alloys, however, are widely used across Asia, the Middle East and Africa.[citation needed] Platinum alloys range from **0 (*0% pure) to **0 (*5.0% pure). The silver used in jewellery is usually sterling silver, or *2.5% fine silver. In costume jewellery, stainless steel findings are sometimes used.