If you want to legally keep property of another that you find, then you should deliver it to the local police department. They will keep it for a set period of time (I think around 30 days) and if no one claims it, then you are the legal owner.
Often, when people lose something and it gets turned into the police, they offer a reward, especially if the item has some sentimental or other special value. Do the right thing, and you might get rewarded without having to feel any guilt about your conduct.
Since you don't know anyhting about the item, pawning it would likely be about the worst thing you can do. In addition, I doubt 14K gold would fetch enough to make any risk worthwhile.
This is not legal advice but a general comment on society based on a limited set of hypothetical circumstances. No one should act or refrain from acting based on these comments without seeking appropriately licensed legal or professional advice. The author disclaims all liability in respect to actions taken or not taken based on his comments.