Go through this guide, and follow all the instructions to get gems quickly in Roblox Noob Army Tycoon. You will get more than 5000 gems per hour.
You have to go to this island next to your Noob statue. This island will make you gems to start with. 
If you buy everything, it will be 25 gems every 600 seconds.
Make sure to do this in a VIP server, or wherever you can be alone! 
This is the army you will want to have if you want to make loads of gems. 
You can use the click and drag tactic to do this simply by clicking and holding! Drag at least 4 units to each point of the map, and keep them there. Just do not do this with boats yet! 
After that, make sure to capture every boat point. 
You will need troops at every point, so you can kill it when the Gems Noob spawns!
The Gems Noob drops 250 gems and can spawn at any point on the map. If you don’t have troops there, you won’t be able to kill them.
Hopefully, they will add codes that will be able to give you gems! Until they add something useful with gems, save them.