Another big expensive rock

Only a short while after two big diamonds were discovered, there's now news of the world's largest ever star sapphire.  It's darned impressive.  And it's way too big to be on a necklace, so I'll be curious to see what museum gets it to show off.

World's largest blue star sapphire found in Sri Lanka

The article linked above has a picture.  It's roughly the size of a hen's egg, but worth considerably more.  (Of course.)