Clarity: Clarity assesses the internal characteristics of the diamond as it formed in nature. This C factor is graded on a 10-grade scale and also impacts the diamond's rarity and value.
The fastest marathon ever was run by Geoffrey Mutai (2:03:02) at the Boston Marathon on April 18, 2011. But because the legendary Boston course does not meet IAAF layout standards, the World Record belongs to Patrick Makau (2:03:38) recorded at the Berlin Marathon on September 25, 2011.
Whilst accomplished runners will be aiming for finishing times of around 2 hours 30 minutes, the worldâs fastest time ever is 2 hours 3 minutes and 59 seconds which was set by Haile Gebrselassie of Ethiopia on September 28, 2008.