![]() ![]() So, to convert the weight of your gold from grams to troy ounces, divide it by 31.1, and to obtain its equivalent in ounces, divide its grams by 28.34.įor example, 10 grams pure gold is equal to 0.32 troy ounces, or 0.35 ounces. One troy ounce is equal to 31.1 grams, while a regular ounce is equal to 28.34 grams. Calculating the Weight of Pure Gold in Ounces and Troy Ounces Simply multiply the weight of your jewelry in grams by its purity.įor 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 Grams Determining the Amount of Pure Gold in Your JewelryĪfter you’ve weighed your gold jewelry, you need to apply the purity percentage you’ve already calculated for each item to its weight in order to figure out how much of it is pure gold. You can weigh your gold in grams, but many jewelers and gold dealers use troy ounces and pennyweights, so you might need to also convert your measurements to these units. If you weigh jewelry of different karats, don’t put all items on the scale, but only weigh together pieces of the same karat. Don’t weigh your gold jewelry along with any diamonds or other stones it may have – you need the weight of the gold alloy parts only. In order to weigh your gold, you will need a sensitive scale. This calculation is straightforward: Just divide the karat number of your jewelry by 24 and multiply by 100.įor example, if you have determined that a gold item is 18 karats, dividing 18 by 24 gives you 0.75, which is equal to 75% gold content. Once you know the karats of your gold jewelry, it’s best to convert them to a percentage in order to figure out what part of the gold alloy you have is actually pure gold. All you need to do is buy a gold testing kit, which will contain bottles with nitric acid, and follow the instructions included. The jeweler will scratch your item and take a small sample of its material, and its purity can be determined by the way the alloy reacts with the acid. ![]() Most jewelers do such tests, and if you go to a jewelry store, they will most likely use nitric acid to determine the karat of your gold. If there are no marks on your gold jewelry, you can have it tested for purity. For instance, converting the 583 mark mentioned earlier, we can see that it is actually equal to 14 karats. To convert parts per thousand to karats, divide by 1000 and multiply by 24. Parts-per-thousand values can be converted to a percentage by dividing by 10.įor example, the parts-per-thousand mark 583 means that the jewelry contains 58.3% pure gold. The standard karat numbers you are most likely to see are 10K, 14K, 18K, 20K, and 22K.Īnother common way of marking gold jewelry is by using parts-per-thousand numbers instead of karats. The karat marks on gold jewelry are usually stamped in places that are not readily visible, and karats are denoted by the sign K or Kt. Determining the Karats of Your Gold Jewelryĭetermining the karat of gold jewelry can be done by either looking at its karat marks or testing the gold alloy to see how much pure gold it contains. ![]() ![]() To calculate the actual amount of pure gold in your jewelry, first you need to know its weight and karat. ![]()
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