Increased Critical Strike Support 20% Quality

You are incorrect.

The level 1 gem gives 50% increased Critical Strike Chance and +1 to Critical Strike Chance.

The quality bonus is 1% increased Critical Strike Chance per 1% quality. At 20% quality, this is a total of 20% increased Critical Strike Chance.

Your gem has the correct total values of 70% (50% + 20%) increased Critical Strike Chance, and +1% to Critical Strike Chance.