This package gives you 6,000 Gems in total. The +50% bonus is already included in that 6,000 - you will not receive 6,000 Gems and then an extra 50% on top.
What You Get
6,000 Gems in total, added straight to your account
That total is made up of 4,000 base Gems + 2,000 bonus Gems (the +50% bonus)