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22 Karat gold contains 91.6% gold and 8.4% other metals. What is 22 Karat gold commonly known as?
  1. 999, BIS, Pure Mark
  2. 750, Platinum, ISO
  3. 916, KDM, Hallmark
  4. 585, Copper, Jewel Mark
Explanation

22-karat gold, which contains 91.6% pure gold and 8.4% other metals like copper and silver,

It is commonly called "916 gold" or "22K gold" and is typically identified by a hallmark stamp indicating its purity. 

Hallmark:
This is a mark stamped on gold jewelry that verifies its purity and authenticity
KDM:
This term refers to a specific soldering process used in gold jewelry

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