From the Kingdom Hearts Wiki: A world of information not accessible by Gummiship
Invi's Keyblade is the longest of the foretellers' Keyblades. It has a light grey handle, and its pommel and guard resemble a silvery blue bough bursting with leaves. The guard is asymmetrical, with an opening on the side of the teeth. The base of Invi's Keyblade features an etching of a silver, blue-eyed cobra whose tail is curled into an "∞" shape. The shaft is formed by a bluish silver, jagged, kris-like blade with a wide, darkened middle, which is etched with a cream-colored ivy design. Near the teeth of Invi's Keyblade is a heart-shaped symbol similar to Terra's Mark. Curved, leafy boughs also serve as the teeth. The Keyblade's keychain is comprised of small, silver sprigs, and its token is a leafed, silver talisman with a Gazing Eye at its center.