A diamond recently discovered in a mine near Pretoria, South Africa, is an astounding 507 carats.
   
It is a diamond the size of a chicken egg and weighs about a quarter of a pound.
    
But size isn't the only thing that matters because quality also counts. The monster diamond has that covered too.

It is said to be of exceptional color and clarity and is even among the world's top 20 quality gems. 
    
There is no word yet on how much the rock is worth.
    
The same mine produced the world's largest diamond which was over 3,000 carats, and currently resides in a scepter that is part of Britain's crown jewels.

*Originally published September 30, 2009