Knockoffs of specific styles and brands like Tiffany lamps are even more difficult to pass off as the real thing. Instead, it's worth sourcing a true vintage light fixture. Real Tiffany lamps' glass is iridescent and varies in thickness. Though they're more expensive, real vintage lamps are worth the investment for their craftsmanship — many vintage pieces were built to last years longer than modern mass-produced pieces. Avoid a tacky design with low-quality knockoffs, and instead invest time and money into sourcing a true vintage item that will better benefit your space.