Gold won't tarnish, rust, or corrode, and though it's very strong, it is also the most malleable of all metals.
24 karat = 100% gold
Too soft for jewelry
22 karat = 91.7% gold
Very soft — not recommended for jewelry
18 karat = 75.0% gold
Recommended for fine jewelry
14 karat = 58.3% gold
Recommended for jewelry
12 karat = 50.0% gold
Not acceptable for jewelry
10 karat = 41.7% gold
The legal karat limit considered as real gold in the United States
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