In terms of composition, 14k gold contains a larger quantity of actual gold than 10k gold. A piece of 14k gold contains 14 parts gold and 10 parts other metals, while 10k gold has 10 parts gold and 14 parts other metals. However, other aspects must be considered to determine what type is best for an individual.
Although 10k gold contains less gold, the higher concentration of other metals makes it more durable than 14k gold. Real gold is fragile and easy to bend while other metals are much stronger. A piece of 10k gold jewelry is also less expensive than an identical piece of 14k gold jewelry.
The additional metals in 10k gold trigger an allergic reaction in some people. There is enough additional gold in 14k gold that it is less likely to cause an issue.