The Facts: 9ct vs 18ct
One of the questions we often get asked is what is the difference between 9ct and 18ct. Below we have explained what the differences are and the pros and cons of these two options.
You may be wondering what exactly the ‘ct’, sometimes seen as ‘K’, refers to. The ‘carat’ of a metal denotes the percentage of pure gold in the alloy, with 9ct being 37.5% and 18ct 75% pure gold. Many come in and ask if it is true that 9ct gold is harder than 18ct gold. This is a misconception. In the case of white gold, the reverse is true, 18ct white gold in considerably harder than 9ct white gold. In yellow and rose golds, the hardness between the two is virtually the same.
Gold, in its pure form, is one of the least reactive elements so 9ct gold, having been mixed with a higher percentage of other elements, is consequently more likely to be damaged by exposure to chemicals, such as chlorine for example. Exposure to chemicals and perspiration can mean your 9ct jewellery may appear dull and discoloured. At the end of the day, 18ct gold is worth the higher price. It has twice the gold content of 9ct making it superior in terms of durability and performance.