All the random gem generator tables (http://paizo.com/pathfinderRPG/prd/ultimateEquipment/appendix.html#generat ing-gems) in the PRD's treasure generator appendix from Ultimate Equipment are missing their Grades, which are necessary to follow the generator's usage instructions.
For example, the table header Greater Semi-Precious Gem (Craft DC 20) should read Grade 4: Greater Semi-Precious Gem (Craft DC 20), as it does in Ultimate Equipment (p. 388).