All sales and business conducted in Cambodia is done by women. They handle and are in charge of all cash. Here at the mine it was no different.
Miners keep their largest gems for repeat customers and those who go straight to the mine. The quality is not sorted. It is up to the buyer to choose and guess. Highest risk yes, but also highest reward.
My gemologist explained it is like playing the lottery even the most trained eye cannot be sure of the final gem size and quality. A lot of it is sheer luck.