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The registered trade mark shows the differences in quality. For example: “14k” means 58.3% is pure gold, “18k” is 75% pure gold. When you see the stamp “14k” this means that 14 of 24 parts are pure gold. The remaining 10 are alloy. Alloy is a mixture of several different metals added to strengthen, or in some cases to change the color to a whiter tone or a rose tone.
