Pietra Serena is an iconic Italian sandstone, though often categorized as a limestone in commercial trade, primarily quarried in the Firenzuola region of Tuscany. Celebrated for its uniform, sophisticated grey-blue to cerulean tonality and fine-grained texture, it serves as the architectural signature of Renaissance Florence. This versatile stone was championed by Filippo Brunelleschi for masterpieces like the Basilica of San Lorenzo and the Ospedale degli Innocenti. While prized for its minimalist elegance in modern interiors and claddings, its history is ancient, dating back to Etruscan fortifications. Notably, its timeless aesthetic famously inspired Steve Jobs, who selected it for the signature flooring of Apple Stores worldwide.