does anyone know how much rough opals are worth?
957876
The price varies.\n\nThe location and quality are very important.  Some rough opals are not much better than rocks.  Others command a high price.\n\nThe biggest problem is that until cut, one never knows the quality of the finished item.  Years of experience help, but is no guarantee.\n\nBuying or selling, contact an opal dealer with a good reputation.\n\nCheck out the site below for high quality rough:
573918
Do a search of current and completed eBay auctions to get an idea of current street value.\n\nBecause so many comics were made, it usually takes many years for the number to go down enough for an individual comic to be worth anything.
57083
try searching for them on ebay checking completed sales in advanced search. Unlike other methods, this will actually give you a sense of what you actually can get for them
428018
Well if you know how old they are they maybe worth more then what you pay for them. My advice is you need to look it up on some web site find the name of the company or who made it and look up some back ground on it you never know might be realy old!
905838
More than likely 1 cent. Maybe more depending on condition, but still less than $1. Try looking it up online you should be able to find something.
664831
Petoskey Stones vary in value.  On Ebay I just found 137 Petoskey Stones for sale that were all in the range of 8-15 dollars apiece.  It seems as though if you can find a way to make a ring or a piece of jewelry out of it, you can up the price almost by 30-40 dollars.
505785
If in greatcondition it most likely is worth at least five hundred.  It may be worth more.  \n...A nice one and sure is accurate
188815
eBay is a terrible place to assess value for anything other than the most high-end, hard-to-find items. Buy a copy of Becket Baseball Card Monthly, the standard for card prices. \nI agree with the above poster about the umm, design for the 1987 set. However, I would revise the valuation upwardly to, perhaps, around $50, based mostly on the strength of the McGwire card and the growing appreciation in prices of 1980s sets. But definitely check this with BBCM.
476355
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.
450849
Diamonds are not rare. South Africa has a bunch in storage that they hide until the current ones are sold.\n\nAs for worth, that depends on the size of the diamond, cut, clarity, and flaws---and the current market price.
483035
send link to picture, I'll check it out.  Also, try Ebay.  An item is only worth what people are willing to pay for it, and that'll tell you what they're willing to pay for it.
1076122
On e-bay under:\nCollectibles\nRocks, Fossils, Minerals\nMeteorites, Tektites\n\nThe ones listed range in price from $1 to $7 000\n\nOtherwise try a geology fair or shop in your area. I bought a nice Namibian Tektite for $3
297821
I would look on E-Bay under "vintage magazines" or something like that and see if anyone else has same type up for auction.  See what their opening price is and if anyone has bid on it.  That would help.  It would also tell you if there is an interest in the particular magazines you have.  I've been selling some antique crystal on there and sometimes there is just no market for some of it, though, it could change in a week.
131740
Try http://www.riogrande.com/. You can order a catalog from them that shows the diferent stones that they sell. Most are fairly inexpensive.
942463
I included two auction listings below. Based on this small sample, your range is from below $500 to $700. Understand these guys are dealers so what you get will be likely less, say $350 to $500. \n\nAny wear at all....scratches, dents, worn finish or rust damage will reduce the value significantly. \n\nIf you are looking to sell to a dealer or pawn for immediate cash, look for about half to two-thirds that.
658303
What ever you can get. Ebay may help to find the price range.
435641
eBay will give you a good idea of the current market value of the item in question.