I work in the jewelry exhibition hall. What I told you upstairs was not comprehensive, and it was a bit one-sided. You may not understand. Let me explain it to you in detail. Which one of you is commonly known as K-gold in jewelry industry, which means a combination of gold and other metals. 18K means there is 75% gold in it, and GP is counterfeit gold. If your necklace is gold, it is mainly composed of phosphorus and copper. If your necklace is silver, it is mainly made of nickel and zinc.

More specifically, 18KGP is gold-plated or gold-plated jewelry with 18K gold plating or gold-plated layer.