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9ct VS 18ct Gold

September 27, 2017

Often customers ask the question, what are the benefits of 18ct gold compared with 9ct? There’s generally a misconception that 9ct is more durable – this is not the case. Here we will quickly run through the pros and cons of each alloy. 

9ct gold is composed of 37.5% pure gold – hence the gold mark 375 - then alloyed with other metals to produce the desired colour. As there is a smaller gold component and a greater component of other alloys, the metal is less durable than 18ct gold. It will tarnish and corrode more easily, especially when exposed to the wearer’s skin acids over time. However, because of the lower gold content, 9ct gold is a lot more affordable. It’s perfect for more casual jewellery pieces and dress rings with large semi-precious gem stones or earrings that have less contact with the wearer’s skin.

18ct gold is composed of 75% pure gold and is stamped 750. Because pure gold has more tenacity and flexibility than the other metals it is mixed with, and as it’s the dominant component, this alloy is more durable and is unlikely to corrode and tarnish with normal wear. 18ct gold is perfect for wedding and engagement rings and jewellery pieces that are to be worn every day. It’s our preferred metal for precious gems such as diamonds, spinels, tourmalines, opals and sapphires. It’s the more expensive choice, however highly worthwhile for fine jewellery pieces. 


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