Gold jewelry comes in many different purities. These are often referred to as ”karats”.
The standard in Gold is 24 karat. This is pure gold, without imperfection or alloy. Gold is measured in Troy Ounces, so there is 31.103 grams in an ounce (we’ll use 31.1). Any time you want to figure the purity of gold you divide the karat purity by 24. For example – 18k is 75% pure (18/24=.750). The chart below gives details to the rest of the normally seen purities.
These numbers will help you know how much gold you have in your jewelry and gold items. If you have other questions on gold just give us a call. We also buy gold jewelry by the karat weight. 520-881-7200.
|Karat||Purity||Grams : Pure Ounce||Comments|
|24K||100%||31.10g||This is pure gold!|
|22K||91.7%||33.91g||Most Far East countries prefer 22-24K gold for jewelry.|
|21.6K||90%||34.56g||Many coins are 90%. This karat weight is not usually used in jewelry…unless it is made from a coin!|
|18K||75%||41.47g||Often used in high end and custom jewelry.|
|14K||58.5%||53.16g||This is the most common karat weight for jewelry.|
|10K||41.6%||74.75g||In the US 10K is becoming the most commonly used weight as many jewelry stores try to lower their costs.|
|9K||37.5%||82.93g||Scarcely seen. Mostly in 19th century Western Europe and UK.|
|8k||33.3%||93.3g||Sometimes used in 19th century Mexico and UK.|