Antique, vintage, and artist-signed glassware can command significant financial value on the secondary collector market. Highly sought-after pieces include authentic Tiffany Favrile glass, early American pressed glass, rare mid-century modern art glass by designers like Lalique or Murano masters, and uranium glass or Burmese glass items prized for their unique reactive chemical properties. Condition, rarity, historical provenance, and signature hallmarks heavily influence overall market worth.