Does a high gold K weight mean a harder or softer metal?

24k is pure gold, and that the highest number you will find, but if you are looking for the most durable gold jewelry with the highest gold purity as well, 18k is your best choice.

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The higher the K the softer the metal, but you should remember that the additional alloy can also possess different levels of softness. Some people think that pure gold is extremely soft and that the alloy metals are always very firm, thus the overall hardness of the jewelry depends only on the balance between pure gold an the metal alloy. This is true to some extent, but among different metal alloys there's a variation of hardness level. The metal alloys in "white gold" are typically harder than the metal alloys in "yellow gold".

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I wouldn't say that "the harder the jewelry, the better". It is true that a durable piece of jewelry must not be too soft, but on the other hand I believe you wouldn't want your gold piece to be only 50-60% pure gold when you can obtain a decent product of 75% gold. Furthermore, some ring settings can be efficiently assembled only in relatively soft metals, while other setting need a much more hard metal composition. Therefore you should first focus on the style you want (what type of jewelry are we talking about, how important is the pure gold component for you, if we are talking about a diamond ring then what king of ring setting do you wish you wish to have, etc). Once you answered the above questions for yourself you could look for the most suitable metal for you, easily avoiding the risk of obtaining a metal which is too soft.

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Karat weight (not to be confused with carat weight, which is how the weight of diamonds and gemstones are measured) refers to the purity of the gold. Each Karat counts for 1/24 of the weight, so gold that is 24K is 100% pure gold. Gold that is 18K is 75% pure gold, mixed with copper, silver, zinc or other metals to attain different colors; 14K gold is 58% pure gold. So intuitively, the higher the Karat weight the more expensive the gold. However, since gold is a soft metal, pure 24K gold is very soft and not particularly resilient. The lower the Karat weight and the more other precious metals are mixed in with the gold, the harder the gold alloy with be.

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As the K weight of the gold becomes higher so does its purity. The higher the K weight the purer the gold. Pure gold is softer than alloyed gold mixed with silver or nickel thus a higher K weight would mean a softer metal, susceptible to scratches and dents.

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