The first task on the Setup blackboard tells you to scope out the casino.
Remember that the first time you do the heist is free, but if you want to do it again, you’ll have to cough up GTA$25,000. The most important part is the preparation stage, where you get multiple steps to complete and several options for each. The good news is that you can set it all up on your own, as you won’t need more than one player to complete it. The Diamond Casino Heist is one of the biggest in GTA Online, so it requires meticulous planning if you intend to get the highest payouts. Read on to learn how it works from start to finish and how to complete it and earn up to GTA$3,619,000. Overall, the Diamond Casino Heist can be pretty hard to complete, so if you’re stuck on it or just want to see how to finish it properly, this guide will help you. Once again, support crew members are available, and you can hire them to help you with the preparations and facilitate the heist. Both these and the setup missions are completed in Freemode, and you can also do several optional ones to make it easier. It’s similar to the Doomsday Heist, as you once again have to complete Prep Jobs to reach the Finale. You can complete the heist with only one other player or more.
It was added to the game in December 2019 as part of the Diamond Casino Heist update. Diamond Casino Heist is one of the several heists players can do in GTA Online, the multiplayer part of GTA 5.