The only criterion is that green CAC coins must be in the top 50% of the grade, preferably for both eye appeal and technical quality. Gold CAC coins must be in the top 50% for the next highest grade.
I say 0% for gold beans and 10% for green, and many of those few may have turned in their slabs since CAC beaned them.
One dealer said 25% even though several coins that I had purchased from him did not CAC (that dealer places excessive importance on originality to the point that he loves dirty coins that CAC apparently hates!).
And no worries because CAC will buy your coins that you dislike, sight-unseen, for fair prices. And has a de facto grading guarantee for their rare blatant mistakes.
Comments
So, the coins that got a sticker deserved a hearing, got a hearing and the opinion was the coin deserves a sticker.
Just my opinion, though.
As John said, grading is an opinion.
Coin in case idle for 6 months=send raw to CACG.