"18k" refers to the purity of the gold, in this case 18 karats. "ch" may indicate the chain style such as cable, curb, or hollow rope. This means the necklace is made of 75% pure gold and may have a specific type of chain.
what does 18K SAC mean in a ring
The "ch" on 18k refers to the purity of the gold in the jewelry item. 18k gold is 75% pure gold, with the remaining 25% made up of other metals such as copper, silver, or zinc. The "ch" stands for "carat," which is a unit of measurement used to indicate the purity of gold.
what does 18k pad on a ring mean
This means that the jewelry is gold plated with 18 karat gold. You can get different kinds of gold in your jewelry.
Probably that it was # 766 of an 18k Design.
What does b 18k mean
It Means that it is made in Peru, of Sterling Silver and 18 carat gold. Pieces typical of this hallmark configuration have a large sterling silver base with a thin 18K gold figure in the center. I've mostly seen this hallmark on Brooches, pendants and a few bracelets. If you search on e-bay you will find a number of items with a similar hallmark listed under "Peru Silver".
Gold
LHGE is the logo of the company who made the piece.
18K gold Made in Italy
18k refers to the gold content (18k = 75% gold) with the rest being silver or other metals 159 refers to the purity of the silver