Pure gold is so soft it can be molded by hand, but to make it harder and stronger, goldsmiths add copper, nickel and silver to it. In some cases, a little zinc is added to prevent the copper content from being too high, as copper is corrosive and will damage the gold. The higher the percentage of gold used in jewelry, the more expensive it is. Best gold necklaces A gold necklace you buy at a jeweler's is typically made from between 10 and 90 percent gold, with the rest made from other metals. This is to make it more durable and suitable for everyday use. If your gold necklace isn't pure gold, the jeweler should be able to tell you exactly what it's made from.
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