18k vs 14k - Differences?

[vesnyder]

I have an old two-tone Datejust from 1984 that is 14k. I assume that means both bezel and band? What are the differences between the 18k and 14k two tone watches? Someone told me that since the 14k is not as soft, the band will wear better. Is there a difference in value? How about color - can somebody tell by looking that the watch is 14k when compared to 18k? Is there a value difference?

Thanks in advance ...