Pink Diamonds

A news article on the BBC website (click here to read it) caught my eye yesterday. It was about the largest pink diamond ever mined. Without wanting to get into the nitty gritty of how much it is worth, how many carats it is, etc,  I thought I would focus today's posting on diamonds and what it is that makes them pink (and other colours). Unfortunately, from the chemical point of view, pink diamonds (and red, purple or brown diamonds) are quite ...