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.
So in our example above â the 5k pace of 8:46 would be comparable to a maximum aerobic effort pace of about 8:30. Taking that 8:30 pace and projecting a race that is run at about 88% of that effort would net you a half marathon pace of about 9:36 per mile for a finish time of about 2:05.