Karat stamp chart , anyone can determine the purity of metals. It is often used to check gold purity, but it is applicable to silver, platinum and other metals. These charts have numbers which indicate the purity level. For instance, 10k gold has a purity level of 41.6%. If the chart shows .925 sterling silver, it means the metal has a 92.5% pure silver content.
A 900 Platinum is 90% pure (n other words, 900 parts out of 1000). For a 950 platinum, it is 950 out of 1000. 24k gold is 100% pure. 22k has a 91.6% purity level. 18k gold has a purity level of 75%. These guides also indicate a metal’s common alloys.
For 925 sterling silver it is copper. For 950 and 900 platinum, it is ruthenium, rhodium and palladium. 22k gold common alloys are silver and copper. For 18k gold they are copper, nickel and silver. For white gold it is palladium.
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