Is it legal to sell it if I find it?
122820
You should get 2-3 prices from different jewelers if possible.  They will often offer more if they know you are shopping around.  You should also make an attempt to find the owner.  Some diamonds are marked and can be traced.
342937
You can put it on www.craigslist.org for free. Just put something like $150 or best offer and see what happens. But if it's only in fair condition, I would'nt expect much.
199076
Yes, as long as the CD you originally purchased isn't burned or otherwise duplicated illegally. If the CD you purchased is totally legal, you can resell it however you like. (As long as you don't burn a copy of it).
216274
Have an apraiser come out and take a look at it.  I know that is probably not the answer that you were looking for, but I wouldn't trust someone who has not seen it to know what it's worth.
150605
I'd keep an eye on ebay for similar items to get a ballpark and then try to sell it online on ebay or a similar service.
592700
No I would keep it.  If I found it in a wallet with identification however....I certainly would contact the person to return their money and wallet.
400336
probably depends on what you mean. If you sell something you have to make sure the person gets what they bought!!
471290
It depends on if he is selling it for profit or for loss. Be specific, please.
242485
Check out completed auctions on eBay.  If it is very valuable you may want to go with a traditional auction house.  Otherwise selling it on eBay or to an antiques dealer is probably a good idea.
121793
You could go to any consignment shop and see how much they think it is worth? And then you could sell it on EBay.
551761
yes it is legal, if it was bought in CA
675227
Dude, \nJust put it on Craigslist.com.  It will sell like hotcakes!
297984
Call or take it into a coin broker or rare coin shop.  You should look at a few books before you actually show it to them, as they will always offer you less than it is actually worth!  Never sell it on the same day that you inquire about it & don't give up any of your personal info to them.  Gather as much info as you can, then make a decision as to whether or not you will sell it.  Sometimes, if you can afford it, it is better to adopt a "wait & see" attitude if your bill is a silver certificate, because some are so extremely rare.  The U.S. Treasury Department may be able to advise you.
104732
Definetly list it on Ebay.  I just checked the site and saw some listed.  You can search for them, and see how much one in a similar condition as yours is selling for.\n\ngood luck
458636
List it on Ebay for a penny and see if anyone bids - that's what it's worth....whatever the market is willing to pay.\n\nBest wishes,\n\npup
672109
Maybe someone sells old copies on E-Bay
37623
try a pawn shop. but if you have a little time i would put it in a news paper. they do sell very quick