Strictly speaking, an authentic Tiffany lamp is a lamp that was crafted by Tiffany Studios under the direction of Louis Comfort Tiffany between the years 1890 to 1930. Such lamps cost at least $4,000, and one even sold for $2.8 million at auction in 1997. By this strict definition, none of the lamps on this site are authentic Tiffany lamps, and indeed, you likely will not see an authentic Tiffany lamp for sale anywhere online.
However, “Tiffany lamp” nowadays refers to a leaded stained glass lamp produced using the same methods developed by Louis Comfort Tiffany in the late 1800s. By this broader definition, the lamps on this site are indeed authentic, because they are handcrafted in the same manner as those created by Tiffany Studios. Just don’t expect to see any of our lamps priced at over $4,000.