Store description:

Metal: Solid 18K/750 Rose Gold 
Weight: 1.9 Grams 
Gold Chain Size: 40 - 45cm (adjustable) 
Pearl Size: 9 mm 
Come with Luxury Gift Box Package 

18K gold is 75 percent gold mixed with 25 percent of other metals. The other 25% usually consists of metals such as zinc, copper, nickel, etc.

Usually, you will see a stamp on the gold jewelry such as G18K, 18Kt, 18ct, 18k, or AU750