Since the late 1930s, Zippo has incorporated precious and premium metals into its iconic lighter cases, blending durability with luxury. Early models featured gold-filled finishes and, by the 1960s, solid sterling silver became popular among collectors. Over the decades, Zippo introduced limited editions with 24k gold plating, sterling silver engraving, and titanium cases known for their strength and modern appeal. Today, Zippo continues to produce collectible models using gold, silver, and titanium, appealing to both traditional users and luxury enthusiasts.