How Pure Is Your Gold?
24 karats = 100 percent gold
22 karats = 91.75 percent gold
21 karats = 87.5 percent gold
18 karats = 75 percent gold
14 karats = 58.5 percent gold
12 karats = 50.25 percent gold
10 karats = 42 percent gold
9 karats = 37.8 percent gold
8 karats = 33.75 percent
GOLD PURITY & COLOR GUIDE
Before we understand the difference between 24k, 22k & 18k gold, you must know what karat stands for: karat is basically a unit used to measue the purity of gold. The higher the karatage, the purer the gold.
24K GOLD: 24k gold is also known as pure gold or 100 percent gold. this means that all 24 parts in the gold are all pure gold without traces of any other metals. It takes on a distinct bright yellow color. Since, this is the purest form of gold, it is naturally more expensive than 22K or 18K. It is not suited for regular forms of jewelry. But if you want to buy coins and bars then these must be in 24K gold purity. 24K gold is also used for electronics and medical devices such as those used for children suffering from ear infections.
22K GOLD: 22k gold jewelry implies that 22 parts of the jewelry amounts to gold and the balance 2 parts are some other metals(copper or silver). This kind of gold is commonly used in making regular jewelry. the addition of other metals in this gold helps to make gold harder thereby making the jewelry durable. 22K gold is not preferable for diamonds and heavily studded jewelry.
18K GOLD: 18k gold is 75 percent gold mixed with 25 per cent of other metals like copper, silver etc. Usually 18k gold is helpful in making highly studded jewelry and diamond jewelry. this kind of gold is less expensive as compared to 24K and 22K. This one has a slightly dull gold color. Recognizing 18K jewelry is rather simple - you will see the item stamped with 18k, 18kt.,18K or a variation similar to these. At times, 18k gold is marked by 750,0.75 or a stamp similar to these.
24K GOLD: 24k gold is also known as pure gold or 100 percent gold. this means that all 24 parts in the gold are all pure gold without traces of any other metals. It takes on a distinct bright yellow color. Since, this is the purest form of gold, it is naturally more expensive than 22K or 18K. It is not suited for regular forms of jewelry. But if you want to buy coins and bars then these must be in 24K gold purity. 24K gold is also used for electronics and medical devices such as those used for children suffering from ear infections. 
22K GOLD: 22k gold jewelry implies that 22 parts of the jewelry amounts to gold and the balance 2 parts are some other metals(copper or silver). This kind of gold is commonly used in making regular jewelry. the addition of other metals in this gold helps to make gold harder thereby making the jewelry durable. 22K gold is not preferable for diamonds and heavily studded jewelry. 
18K GOLD: 18k gold is 75 percent gold mixed with 25 per cent of other metals like copper, silver etc. Usually 18k gold is helpful in making highly studded jewelry and diamond jewelry. this kind of gold is less expensive as compared to 24K and 22K. This one has a slightly dull gold color. Recognizing 18K jewelry is rather simple - you will see the item stamped with 18k, 18kt.,18K or a variation similar to these. At times, 18k gold is marked by 750,0.75 or a stamp similar to these.
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