It means 18K!
The jewelry produced in ordinary points is sometimes no letter!
It you can get the place where gold and silver processing, or the jewelry shop can ask!
It is 18K to write 18K, 750 or G750, k750
Fake. The real 18K is engraved with AU750 or G750 or 18K. It is estimated that your one is not 18K gold.
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