How to convert 23K gold to 12K
23K gold is 95.8% pure and 12K gold is 50.0% pure. To find the 12K weight with the same gold content, multiply the 23K weight by 0.958 and divide by 0.5. One gram of 23K equals 1.916 grams of 12K.
Example
10 g of 23K gold contains 9.58 g of pure gold, the same as 19.16 g of 12K. Today 10 g of 23K is worth $1,275.
When you need this conversion
- Exchanging old jewelry for new pieces in a different karat.
- Comparing prices quoted per gram of 22k with prices quoted for 18k or 24k.
- Planning how much of a karat a jeweler needs to remake an item.
Note that remaking jewelry involves melting losses and labor, so a jeweler's exchange rate is usually below this pure-gold equivalent. See methodology.