The jewelers mark means it has just been marked by a certain person. Think of it this way a brand you brand cows with is a mark of a farmer so he knows what cows are his. That is what a jeweler does.
It probably indicates gold plate.
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HDS is the maker's mark for Helzberg Jewelers.
Most likely it is Gold shell (gold plated) But it could be a jewelers mark.
Probably a jewelers mark or brand. It is unlikely to be a measure of the metal.
GDM Jewelers is the name of the company that made the necklace.
"There are numerous jewelers that sell chamilia bracelets. Some of the stores are Ski Jewelers, Michael Kohn Jewelers, G & W Jewelers, Roman Jewelers, and Accents in Silver."
Mark Zuckerberg
Ceramics
This mark refers to wholesale jewelers H Nathan and Co of Fore Street, London.
It is the makers mark for Sandeep Diamond Corp. in New York, NY. They are wholesale jewelers to the trade.