Final carats tally comp., page-318

Gemfields were mainly focused on their primary deposits (lower quality) and selling literally millions of carats of them. At a low price.

They also had some secondary deposit rubies (higher quality) mined which wold at a much higher price.

They then switched to higher focus on secondary deposits because that's where the money is.

MUS and Gemfields both have primary deposit sourced rubies in their sales mix as there is demand for them.

MUS has focused more for the first auction (originally at least) on having secondary deposits to put them on the map.
With the massive increase in carat count going to auction I am now inclined to believe that there may be a few higher lower carats in the mix now. Maybe from speaking to buyers and getting an understanding of demand. That is why I lowered my expected price per carat from my original $120 to $85 which will still be a great result if achieved.