9ct Gold vs 18ct Gold

by Kate Reid
February 1, 2019 / Jewellery Buying Guide,Learn About Metals

A pile of pure gold pieces before it is added to other allows to creat 9ct or 18ct gold

One of the most common questions we receive from couples planning their custom engagement or wedding rings is "What is the difference between 9ct and 18ct gold?" This guide will walk you through the main characteristics that set them apart.

You may be wondering what exactly ‘ct’ or 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.

Gold in its purest form is too soft to be used in fine jewellery, so it is commonly mixed with other metals to increase its strength and durability, as well as to create unique colours like rose gold and white gold.

Colour

Metal colours

Metal Content

A breakdown of the different metals used in 9ct yellow gold
A breakdown of the different metals used in 9ct white gold
A breakdown of the different metals used in 9ct rose gold
A breakdown of the different metals used in 18ct yellow gold
A breakdown of the different metals used in 18ct white gold
A breakdown of the different metals used in 18ct rose gold

So which metal is best? Read more to learn about their durability for everyday wear and their ability to resist tarnish from everyday chemicals.

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