Many items in Baldur's Gate, so-called "artifacts", have their own history, and therefore should exist in a single copy. But, there are many cases when player gets the same item twice, or thrice, or even more. It ruins the atmosphere. This mod was created to remove excessive copies of supposedly unique items (like Boots of Speed, Ring of Wizardry, Ring of Protection +2: 'Guard's Ring', Heartseeker +3 etc).
Unique Artifacts takes care not just about the original game, but also removes duplicates introduced by mods.

but I'd be grateful if you place it on BWL too:)