Shang Tsung's Skull Amulet is a sinister and ornate piece of jewelry, featuring a meticulously detailed human skull at its center. The skull is carved from dark, polished bone or a bone-like material, with hollow eye sockets that seem to glow faintly with an eerie green or purple luminescence, suggesting magical properties. The amulet is encased in intricate metalwork, possibly gold or a dark, tarnished silver, with swirling, serpentine designs that wrap around the skull, enhancing its malevolent aura. The chain is made of heavy, interlocking links, each etched with tiny, arcane symbols that hint at the amulet's dark powers.