You use one-of-a-kind to describe something that is special because there is nothing else exactly like it.
(mainly AM) adj ADJ n
...a small one-of-a-kind publishing house.
Translation English - Cobuild Collins Dictionary
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"