Stone Panels International (SPI) originated and pioneered the unique manufacturing process that has established us as the wor ... ld leader in light-weight natural stone. From our original conception nearly 40 years ago in a small quarry in Ireland, Stone Panels has long been established as the premier producer of natural stone composite panels and continues to lead the stone industry in innovation, technology, and proven results. No other company can match Stone Panels International product capabilities, technical expertise, global testing, international authority approvals, experience and proven performance on thousands of buildings throughout the world. read more