All of these items have the interest and fascination of collectors.  Before you make a bid, you may want to research the item that is up for sale.  Remember, Members selling items are not often the experts in these fields.  Many Sellers, (not all), are quite often just a broker for a private outlet.  Ask questions about the item!  Do you homework before placing a bid.  When it comes to gemstones, well let's say "Size Does Matter!".  The age old saying, "A picture is worth a thousand words" is not true.  Pictures can be made to enhance an item and not really represent the true size, color weight or nature of the object for sale.  Make sure that the description matches the item for sale.  Too many times, bidders purchase these types of items only to find out that it was not really what they wanted or even say in the ad.  An honest Seller will advise and respond to your questions.  If you are not satisfied with the answer "Don't Bid".  This way you will not be leaving a negative response to the purchase, only because you failed to understand the Sale, Description or even what the item is you are bidding on.  Use the Internet as much as possible to gather information on any item you are not sure of, before bidding.   Thanks for this time to let us pass on a few words of wisdom.  Our company has been around for over 30 years and we can safely say, "We've seen alot!"  Visit often, Bid often, buy often.