How to read jewelry trademarks

2019-05-17 Business No comment

The digital markings on precious gold jewelry are a bit confusing for many people. We are usually used to see carat or silver markers like this: 10K, 14K, 18K, Sterling, etc. These numbers mean the same thing.

The figure for 14k is technically 583, but most manufacturers use the European method to make 14k gold slightly more than 14k, so the mark in most 14k jewelry is 585. The 18K mark is 750. If the mark is valid and there is also a manufacturer mark in the jewelry, the figure indicates that the item is 18k gold.

This is the source of numbers. Pure gold is called 24 carats. For 18k gold, 18 parts of pure gold are mixed with other metals to make the metal suitable for use in jewelry. 24k is a stone that is too soft to stand or keep good. 18 gold is divided by 24, or 18/24 is equal to 750. This is where the numbers come from. Jewelry is 75% pure gold, 750 gold, 250 parts of other metals, "1000" part. It is easier to think of it as a percentage of pure gold in the formula.

The sterling silver is marked 925. The pure silver is 92.5% pure silver, and the rest is other metals, usually copper.


What does it mean if the ring is labeled 14K PR? 14K simply means it is 14K [Karat] gold, because K means it will be made in Southeast Asia or the United States. The PR tag is just the manufacturer or store ID, or even the design tag, regardless of value.

The basic formula for calculating the quality of gold content is very simple, as they are all measured in terms of “thousandths of a thousand”. This means that 9ct gold is calculated as follows: 9 [for 9ct] divided by pure gold [24] and then multiplied by 1000 [for pure gold as a decimal]. Namely: 9/24 * 1000 = 375 This 375 is the decimal quality of 9ct gold, sometimes showing the decimal point in front – .375

The old Victorian standard 15ct gold is calculated the same way – -15 / 24 * 1000 = 625 [not exactly the number on your jewel. Dental gold is 16ct or 666 repeated. But you can also pass from decimal and return. :375/1000 * 24 = 9

In your case, we can use 698/1000 * 24 = almost 17ct


I have a platinum engagement ring and found a wedding ring that I really like, but the band is made of palladium. Is it safe to use these two metals together without damaging the other metal?

It will use a softer metal OVER TIME, but this can take many years. My grandmother's wedding ring eventually worn off the band of her engagement ring, but it took more than 20 years to do it.

Platinum and palladium are quite good, but I will accept the advice of a local friendly jeweler and let them check the two rings. Sometimes platinum may be lower grades to make it harder – so there are checks.

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