Blade of Roses

Blade of Roses is an enchanted longsword +3 with all the bonuses a normal Long Sword +3, but this weapon also boosts the charisma of wielder with 2 points. This weapon appears in Baldur's Gate II: Shadows of Amn, it can be bought from the bartender in the Copper Coronet, who is selling this weapon after the slaves are freed.

In-game description
"This blade possesses an unearthly splendor, and it is likely that Sune, the goddess of beauty and passion, had a hand in its creation. The effect it has on the wielder is immediate, and more than once in its history has this sword has been the secret behind a lackluster soldier's sudden elevation at court."