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The numbers are probably an indication of the purity of the gold. Pure gold is 24 carat but 22 carat, 18 carat, 14 carat and 9 carat are all common.
On most 18KT jewelry you will see a small stamp on the inside of the band identifying it as just that "18KT".
18% of 20, written as a percent, is 18% of 20. Written as an actual number, it is 3.6
If the bracelet is 15g gold and 5g silver, then the gold content is 15/20 or 75%. Pure gold is 24 carat, so 75% is 18 carat.
18 carat gold
The carats tell how pure the gold is. Pure gold is 24 carat. The fraction of 24 carats that the carat count is would be the fraction of gold in a piece of jewelry. For example, 18 karat gold is 75% gold and 12 karat is 50% gold.
Gold jewelry is marked with karat weight, such as 24-carat gold is fine 99.9%, 18-carat gold is 75% gold, and 12-carat gold is 50% gold. See related links for more details.
75
From its name of 18 carat gold you can tell, if it is truly 18 carat gold, that there is 18/24ths gold and 6/24ths of another metal, possibly copper or platinum. 18 carat gold is (18/24)x100= 75% gold.
18 carat gold is a typical percentage sold in stores. The number refers to the purity of the gold.
18 carat is better than 14 carat. 24 carat is pure gold. 18 out of 24 is 75% gold the rest is made up of silver.
22 carat gold is 91.66 percent pure gold. Since 100% pure is impossible 24 carat, at 99.999% pure is considered as 'pure'. 18 carat, which most jewelry is made of is about 75% pure gold. A carat is a 24th so 22 carat gold is 22/24ths gold, and 2/24ths of another metal, most likely copper or silver.
different materials are mixed with the gold 18 carat is 75 percent gold
Absolutely not. Many semi precious or synthetic diamonds are placed in 14 carat gold settings. The setting has nothing to do with the quality of the gemstone, although higher end jewelry is at least 18 carat gold.
18k means it is 18 carat gold. IDGC is the maker's mark but I am not sure who that maker is unless you look it up in reference.
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