I think only beings more powerful than Sauron could use it. We don't know just how powerul Gandalf is as he was never allowed to reveal himself in his true might and majesty.
Maybe Luthien could have used the ring as she managed to beat Sauron when she went to rescue beren from that tower (i forget the name) Or did she only manage to beat Sauron cause of Huan the hound.
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For him that is pitiless, the deeds of pity are ever strange and beyond reckoning - of Melkor before his final downfall
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