What else do you need then?
24k is 24 parts gold in 24 parts (pure gold).
23k is 23 parts gold plus 1 part other metal.
And so on.
So a Karat is 1/24 gold
If gold is $1300 a Troy ounce then an ounce of 22k is 22/24 x $1300
You may also need the conversion of Grammes to Troy ounces. Make sure you are using Troy and not Avoirdupois as they are different! See the trick question in the following article.
I know the relation between 24K and 22K gold.
As the purity of these two qualities of golds is related by a formula, I believe there should be some formula (may be thumb rule) between prices of these two qualities.
