Hello again, and thanks for your reply with additional and helpful information.
Because there were so many pieces made of white depression glass, it is typically not valued that highly. However, because you have a full set of 12 cups and saucers and they are gold rimmed, in excellent condition, a collector might be willing to pay about $50-$100 for the set. This could vary, of course, re: supply and demand, and how many sets like yours are available.
To get the most accurate appraisal, it might be a good idea to have an experienced, licensed antiques glass appraiser come to your home to look at your set and let you know it's present value, or you might consider bringing one of the cups/saucers to an appraiser in your local area.
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Edited by Cher on 12/1/2010 at 8:53 PM EST