MUS won't just be putting all the rubies together and selling them as one bunch.
They will have lots of different tables and lots of different grades at different tables, perhaps catered to Jewellers (Elite), Jewellers (mediocre), commercial, etc.
I'd imagine the close bid tender would resemble something like these images below found
here.
http://www.*****.com/ind/Zimnisky/images/zimnisky_20140818_4.jpg
When people quote an
Average $ct they are saying after all the parcels are sold, high quality, low quality, commercial etc, the figure is then
averaged over all the parcels and given a final figure.
