Twinkle, twinkle, little star,
How I wonder what you are!
Up above the world so high,
Like a diamond in the sky!

Well maybe the title is a bit far fetched, but I’m really stoked to find out about such a thing; the star in case, BPM 37093 is a variable white dwarf star that consists entirely of crystallized carbon, in the form of diamonds (well, technically speaking, body-centered cubic lattice of carbon; basically, crystallized in the cubic system).

Previous research had indicated that as a white dwarf cools, it crystallizes, starting from the center, and more recent work shows that about 90% of its mass has already done so, making it technically the biggest diamond we know of, at about 10 billion trillion trillion carats.

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Astrophysicists nicknamed the star Lucy, after The Beatles song Lucy in the sky with diamonds. Man, you just gotta love astrophysicists.