The number of gems you can use depends on your skill wheel and of course a on your level, because you need to add points to the gem slots yo activate them.
In order to activate all gem slots (btw there are 12 slots, not 11) you must be at least level 1850.
Also, it is impossible to have 12 physical protection gems, or 12 crit gems. This happens because in Lesser slot you will never have physical protection, neither crit. Physical protection can only be found in the medium slot and crit in the greater one.
I recommend you to check the skill wheel planner at the official website because you can find all possible combinations there.
Here is a link of a skill wheel with all physical and crit actually obtainable:
https://www.tibia.com/community/?subtopic=wheelofdestinyplanner&code=K0Y2BIYZjGMC3F2zuFgYHBiIEhJQVMMYBEgBJAaQYDBkY5BkY2BkZFBkYA