9ct vs. 18ct Gold: What's the difference and does it matter

Pure gold is very soft and isn't always practical to use alone in fine jewellery. For this reason, it's combined with other metals for durability. This durability is particularly important in the instance of gold engagement rings and wedding bands, which are exposed to the elements every single day. Caratage is the measurement of gold's purity; it indicates the volume of pure gold in an alloy. But what do carat gradings mean, exactly? What are the fundamental differences between 18ct and 9ct gold? Is one better than the other? Here's all you need to know 18ct gold is 75% pure gold and 25% other metals (usually a combination of silver and copper). In the case of white gold, that 25% consists purely of white metals, present to contribute a silvery hue.  9ct gold, on the other hand, has a content of 37.5% pure gold

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