Unique jewelry pieces can be sold with a heavy price tag, especially if they have their original stamp or maker's mark. At JewelryWonder.com
, you can set up an online store by uploading photos of pieces you own. If the jewelry was passed down by a relative or looks as if it's a few decades old, it might be just the thing costume jewelry enthusiasts are eager to get their hands on. Pieces by Trifari, a jewelry company popular in the '30s, can be distinguished by its trademark "T" stamp with a crown above it. Other sought-after pieces are Eisenberg Ice, especially pins made of Swavorski crystal (marked with "Eisenberg Originals") from the '30s.