Diamonds Are...

If you're headed to Washington D.C. in the next few months, go to the Smithsonian to check out the Splendor of Diamonds exhibit, which runs till mid-September. Six of the rarest diamonds in the world will be on display, including the 101.29 carat fancy yellow and the sixth largest colorless diamond ever found, the 203.04 carat DeBeers Millennium - composed purely of carbon atoms. CNN reports that while merchants refuse to put a price on these stones, estimates are about $600,000-$800,000 per carat.