Diamond-Tipped Cane

A Diamond-Tipped Cane is an untyped two-handed weapon that may be used by anyone. Its diamond-tip has a bright sparkle, which cannot be overwritten by other enchants. As it has no stats, its sole purpose is cosmetic.

Source
This item can be found within a Bag of Fishing Treasures (Dalaran), which are rewarded from the fishing dailies Marcia Chase offer in Dalaran.