18 karat gold therefore only consists of 75% gold. You might therefore sometimes find the inscription “750” somewhere on an 18k gold ring. The remaining 25% are different metal alloys that give more hardness to the gold.
18K gold is typically used for high-end jewelry like diamond engagement rings.
Obviously 18K gold is the most expensive but it is also the one that is the least likely to tarnish.
It is however more prone to being affected by every-day life wear and tear as it is softer. 18K gold rings therefore require more care than 14K yellow gold rings do.
It is very difficult to see a noticeable difference between a 14k and 18K yellow gold ring with your bare eyes. It therefore rarely pays to buy an 18K gold rings as opposed to an 14K gold ring just for the looks.
18K gold rings are the best choice for anyone who wants to have the most amount of gold in the ring while still having enough durability (compared to 24K gold).
Preferring an 18K gold ring over an 14K gold ring is mostly a mental matter of knowing that the 18K gold ring contains more gold and is therefore more exquisite.