If you are either Madonna or Björk, you already know all there is to know about Karen Walker and her beautiful jewellery. In which case, you can skip this post, Madge (or Guðmundsdóttir), and let the common people clue up for a while.

After the jump: Look! A lobster in a hat!

It's a lobster. Jewellery = diamonds = rocks. You get it.