Hey guys, just wanted to touch on how to read or how to determine gold purity.
Gold purity is typically marked as a number, a decimal or in karats. Purity means the “fineness” of gold, which basically refers to the percentage of the gold that is actually pure gold.
It is fair to say that there will always be some kind of impurity in gold, and therefore it has been determined that three decimal points of 9’s “0.999 ” is considered pure gold. Note that I put that zero before the decimal point just so you see the decimal point… normally the zero would not be there and it would look like “.999”.
So now that you know that .999 pure is considered pure gold. Anything less than .999 pure gold is measured in karats and referred to as “karat gold”. A karat is officially defined as a unit for measuring the “fineness” of gold.
When gold is marked marked in karats, it appears as a number with a “k” or a “kt” next to it, or it may be marked with a number. The number is the European designation representing the percentage of gold. To determine purity as a percentage when marked in karats, simply divide the “k” number by 24 to get the percentage. For instance, if the gold is marked “18k”, then 18 divided by 24 equals .75 or 75% gold.
A number designation is the European way to mark gold purity. To convert the number to purity, simply put a decimal point in front of the number to get the percentage. For instance, if the gold is marked “750”, it is .750 or 75% gold.
So as an example,gold marked 10k is 41.7% pure and gold marked 22k is 91.7% pure. I’d also like to point out that gold marked 24k is considered pure gold.