How to Calculate the Pure Gold Content in Your Jewelry.
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For example, if you have an 18K ring that weighs 7 grams, knowing that 18 karats equals 75% purity, you can calculate that the pure gold in the ring is 5.25 grams. Calculating the Weight of Pure Gold in Ounces and Troy Ounces. One troy ounce is equal to 31.1 grams, while a regular ounce is equal to 28.34 grams. So, to convert the weight of your gold from grams to troy ounces, divide it by 31.1.
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Keep your jewelry from tarnishing as best as you can. When wearing your jewelry, you should avoid exposure to water. Exposure can result in tarnishing, rusting or dulling of different metals. A very light coating of clear nail varnish can be applied to some jewelry, and this will add an additional line of protection against the elements.
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Jewelry made of pure gold doesn't tarnish because it doesn't corrode or oxidize, but gold pieces made with an alloy such as copper or silver may tarnish and turn black. Gold jewelry can also darken when it's frequently exposed to soap, lotion and everyday grime. Clean gold jewelry carefully; rough handling or harsh, abrasive cleansers can do more harm than good. With proper care, gold jewelry.