I don't have enough gems

[PeterPalov]

Yes, you can. Here is the amount of games you should simulate to get some gems:

Multiplayer games bug (i guess)

Some useful stats: Simulations needed for 1,000 : 17,678 simulations. (Good if you’re few gems short) Simulations needed for 5,000 : 988,212 simulations. (You can buy top-tier gear) Simulations needed for 10,000 : 5,590,170 simulations. (You can buy a good hero) Simulations needed for 29,000 : 80,060,814 simulations. (You can buy the most expensive hero) Simulations needed for 100,000 : 1,767,766,953 simulations. (Enough to buy all top-tier hero + gear for one class) S…

Another useful table:
Need better gear? Earn gems for simulating games - #33 by ant?