The Blarney Stone is a block of stone that was used in the construction of Blarney Castle in Ireland on Earth. Kissing this landmark is said to bestow an individual with the skill of flattery.
While inquiring on the function of the Stone of J'Kah, Captain Archer wondered if being blessed by it was to give him good luck. Commander Tucker, however, corrected Archer and told him that he must be thinking of kissing the Blarney Stone, or patting the Buddha's belly. (ENT: "The Andorian Incident")
When Miles O'Brien met his old Captain, Benjamin Maxwell in 2367 and told him, he learned a lot from his former commanding officer, Maxwell responded with: "But you got that silver tongue by kissing the stone, right?". (TNG: "The Wounded")
- In the non-canon novelization of DS9: "Trials and Tribble-ations", Chief Miles O'Brien claims his grandmother sold the Blarney Stone "half a dozen times".