Things You'll Need
Instructions
Examine your glass items to determine what condition they are in. Items that are worn, scratched or chipped will be worth less than identical items that are undamaged.
Purchase a glass valuation guide. If you collect a certain type of glass, get a guide that is just about that type, as it will have more details. Try to find a book with a lot of color photos, which will help you locate your items more easily.
Match your pieces to those listed in the book and read the value that is estimated.
Go to glass shows, conventions and sales and compare your pieces to those on display.
Talk to collectors and dealers and get their opinions about the value of your items.
Have your collection appraised by someone with experience in glass collecting. You will have to pay for an appraisal, but it will be very thorough and detailed and give you a lot of information.