What it actually means is that someone stamped 24KGF on them.
What it may mean, assuming they're not fake, is probably "24 Karat Gold Filled", or in other words, there's a thin (but much thicker than electroplating) surface layer of pure gold over a body of "base metal" (some alloy that's cheaper than gold; most likely brass).
I don't know why the term "gold filled" is used to refer to things that are actually "filled" with something other than gold, but there you have it.
Earings
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Only if the earings have backings
it does not hert when you take your earings out!
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24kgf stands for 24-karat gold filled, which indicates that the necklace has a layer of 24-karat gold bonded to a base metal, typically through heat and pressure. This process creates a durable and more affordable alternative to solid gold, allowing for the appearance of gold without the high cost. The "gf" signifies that the gold layer is at least 1/20th the weight of the total item, ensuring a significant amount of gold is present.