The term "14k" on a necklace refers to the karat purity of the gold used in making the necklace. It means that the gold used is 14 karats, which indicates that the gold is 58.3% pure gold, with the remaining 41.7% being made up of other metals. The "hz" likely does not have a standard meaning in relation to jewelry and may be a manufacturer's mark or code specific to that piece.
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