How to convert 9K gold to 8K
9K gold is 37.5% pure and 8K gold is 33.3% pure. To find the 8K weight with the same gold content, multiply the 9K weight by 0.375 and divide by 0.333. One gram of 9K equals 1.1261 grams of 8K.
Example
10 g of 9K gold contains 3.75 g of pure gold, the same as 11.2613 g of 8K. Today 10 g of 9K is worth $499.19.
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.