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The following is the percent of pure gold in various gold alloys, per the Jewelers Association of America. 10K – 41.7% 14K – 58.3% 18K – 75.0% 24K – 99.99% Generally, pure gold (24K) is ...
2. Purity Gold's purity is measured in karats, with 24-karat (or 24k) being the highest purity level. Investment-grade gold has a purity of 99.99%.
Look for hallmarks All authentic gold bars and coins have a hallmark stamp that indicates their purity. This stamp is a guarantee from a reputable manufacturer that the gold is 100% pure.
“Gold always has to be marked when it’s sold and manufactured in the U.S., so if it’s marked with 10-karat gold it has to be accompanied by a stamp that says who made that piece of jewelry ...
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