Posted By:
Dave SnyderThe pyramid argument makes sense in theory, but I have two problems with it.
1. Whatever is wrong with that Cobb is not a "serious" flaw if you have to look that long and hard to notice it. You should be able to see an immediate issue with an SGC 30.
2. If one assumes that the majority of T206's that exist are in the low-mid grade range, wouldn't you want a greater range of distiction bewteen them since that's the greatest sample size you have to judge?