Numerical markings on precious gold jewelry are a bit confusing for many people. Generally, we are used to seeing the karat or grade of silver as: 10K, 14K, 18K, sterling, etc. The numbers mean the same thing.
For 14k, the number is technically 583, but most manufacturers have adopted the European method and make 14k gold a little over 14k, so most 14k jewelry is marked 585. 18K is marked 750. If the mark is genuine and the jewelry also has a maker’s mark, the number means that these items are made of 18k gold.
That’s where the numbers come from. Pure gold is called 24 karat. For 18 karat gold, there are 18 parts of pure gold mixed with other metals to make the metal suitable for use in jewelry. 24K is too soft alone to stand or hold stones well. 18 parts of pure gold divided by 24, or 18/24 equals 750. That’s where the number comes from. The jewelry consists of 75% pure gold, 750 parts gold and 250 parts other metals out of “1000” parts. It’s easier to think of it as the percentages that are the pure gold in the recipe.
Sterling silver is marked 925. Sterling is made up of 92.5% pure silver, with the rest being another metal, usually copper.
What does it mean when the ring says 14K PR? 14 karat simply means that it is 14 karat (karat) gold, and because of the letter K means that it was made either in Southeast Asia or the United States. PR marks are only an identifier of the manufacturer or store or even a design mark and have no relation to the meaning.
The basic decimal formula for determining the grade of gold content is quite simple, as they are all measured in “parts per thousand”. This means that 9K gold is calculated as follows: 9 (for 9K) is divided by pure gold (24) and then multiplied by 1000 (for pure gold as a decimal). ie: 9/24*1000=375 This 375 is the decimal quality of 9k gold and is sometimes shown with a decimal point in front – .375
The old Victorian standard of 15k gold is calculated the same way – 15/241000 = 625 (not exactly the numbers you see on your jewelry. Dental gold is 16k or 666th periodic gold. But you can also change this formula starting with the decimal and working backwards, that is: 375/100024 = 9
In your case we can use 698/1000*24 = almost 17ct
I have a platinum wedding ring and I found a wedding ring that I really like but the band is palladium. Is it safe to wear these two metals together without damaging one?
Over time, it wears down to a softer metal, but this can take many years. My grandmother’s wedding ring eventually wore off the wedding ring, but it took over 20 years.
Platinum and palladium are very nice together, but I would take the advice of your local friendly jeweler and ask them to check both rings. Platinum can sometimes be of a lower grade to make it heavier – so check that.