Sphalerite is one of the most optically brilliant minerals in existence, possessing a refractive index and dispersion that surpasses even diamond — a fact that makes faceted sphalerite gems among the most dazzling objects in the mineral world. This zinc sulphide mineral occurs in a remarkable range of colours, from honey yellow and deep amber to rich red, forest green, and near-black, with the finest transparent specimens displaying an intense, fire-like play of light within their crystal structure. Found in hydrothermal ore deposits worldwide, sphalerite forms in well-developed tetrahedral crystals and massive forms, often alongside galena, chalcopyrite, and calcite. Our collection features natural crystal specimens, matrix pieces, and select gem-quality examples that showcase the extraordinary brilliance and colour depth of this exceptional and underappreciated mineral.