How to convert 24K gold to 23K
24K gold is 99.9% pure and 23K gold is 95.8% pure. To find the 23K weight with the same gold content, multiply the 24K weight by 0.999 and divide by 0.958. One gram of 24K equals 1.0428 grams of 23K.
Example
10 g of 24K gold contains 9.99 g of pure gold, the same as 10.428 g of 23K. Today 10 g of 24K is worth $1,330.
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.