How can you tell if its costume jewelry?

Check your jewelry for discoloration, scratches, or any pieces that have been rubbed off. If you see a different metal underneath, or if your skin has turned green from wearing the jewelry, its likely the piece isnt real gold or silver.

How do you research antique jewelry?

3. Research Your Vintage JewelryLook for photos of latches, clasps and markings that are similar to those on the jewelry you own. Note the time periods associated with those materials.Search any stamps or markings you found on your jewelry. Check out online sale prices for pieces from that timeframe.