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What is the Rarest Birthstone?

Some people are very attached to their birthstones, others not so much. My birthstone is a topaz and while I like the gem, I wouldn’t say its my favorite (not a big fan of yellows in my gem).

But what is the rarest of birthstones? (Don’t think diamonds, since they aren’t particularly rare)

Think June’s Alexandrite:

Think December’s Tanzanite: