Some of my gold jewellery is marked 375 and some 750. Is there any difference in the quality of gold?
Yes, the 375 mark means that there are 375 parts per 1000 of pure gold in the alloy, or 37.5%. As pure gold is 24 carat, 37.5% of 24 is 9, so the item is made from 9 carat gold. The 750 mark equates to 75% pure gold or 18/24, and is 18 carat. So the carat is simply the percentage of pure gold expressed in 24ths. Common gold standards that may be seen are 375, 585, 625, 750 and 916.
