What does ED 24 K mean stamped on the back of a necklace?

Without seeing the piece I can't say for certain but it's not likely it's made of solid .999 pure gold, which is what 24k represents. This marking gives the appearance of being slightly deceptive, wanting you to think the necklace might be solid gold. The ED designation doesn't comply with any stamping law I'm aware of and more than likely represents Electro Deposited. In other words, gold plated, probably over a non-precious base metal. It would have to be tested by a professional to be sure.
Mr. Wizard

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