What does 10k cm stand for on a ring?
On a ring, 10k stands for 10 karat, which is a measure of the gold's purity.
99% to 99.9% purity of gold is 24 karat, and is also sometimes called fine gold.
Well it really depends on how durable you will need the ring to be. While 14K might cost more, and eventually be worth more in the end, that ring will not stand up to regular wear-and-tear as easily as a 10K ring. Gold is a naturally soft metal, and the higher the content, the easier your ring will scratch/dent/deform. I am of course talking about the general scrapes and marks you get from every-day activities.