To successfully complete the Diamond Casino Heist in Grand Theft Auto Online and achieve the maximum payout, it’s crucial to follow a structured approach to planning, execution, and escape. Here is a detailed guide that includes preparation steps, approach strategies, a focused walkthrough for the Silent & Sneaky method, and essential tips to optimize your earnings.

Access and Preparation
1. Ownership Requirement: Acquire a Penthouse at the Diamond Casino & Resort, which provides access to the heist planning board.
2. Choose Your Approach: The heist can be conducted in several ways—Silent & Sneaky, The Big Con, and Aggressive. Each method necessitates different preparatory missions:
– Silent & Sneaky: Emphasizes stealth, requiring players to avoid detection while neutralizing threats quietly.
– The Big Con: Involves using disguises and stealth tactics to blend in, minimizing direct confrontations.
– Aggressive: Focuses on combat and firepower, launching an all-out assault on the casino.

Choosing the Approach
Silent & Sneaky Approach: This method is optimal for players aiming to extract the highest payout through stealth and minimal encounters.

Step-by-Step Silent & Sneaky Approach

1. Initial Infiltration:
– Enter the casino through the right side entrance.
– Use a stun gun to disable the overhead security camera.
– Access the staff-only door by unlocking the keypad.
– Disable the metal detector by sabotaging its fuse box.
– Use a suppressed weapon to take out the front desk guard quietly.

2. Inside the Casino:
– Carefully pass through the metal detector.
– Continue disabling additional cameras without triggering multiple alarms at once.
– Coordinate with your team to take out guards silently, ensuring simultaneous takedowns.
– Navigate through the double doors and corridors, keeping a low profile and maintaining communication with teammates.

3. Reaching the Vault:
– Once the area is secure, hack into the vault using a mini-game.
– Stealthily loot high-value items (cash, gold, artwork, diamonds) from the vault.
– Focus on high-payout targets first to maximize individual returns.

4. Escape:
– Plan your escape route in advance. Quick exits are essential to preserve your loot.
– Utilize getaway vehicles found nearby, opting for less crowded routes to evade police.
– Consider hijacking a police Maverick helicopter for a swift aerial getaway, enhancing your chances of reaching the buyer unscathed.

5. Selling the Loot:
– Deliver your stolen goods to a buyer. Choose high-level buyers despite the longer travel distances, as they offer better payoffs.
– A helicopter escape from the casino to the buyer minimizes risks and reduces the chance of police ambush.

Tips to Maximize Your Payout
– Thorough Setup Missions: Execute all setup missions to equip your team with the best gear and intel for the heist.
– Select Skilled Crew Members: Choose players with high proficiency in essential roles such as hacking, shooting, and driving to enhance efficiency.
– Stealth Preference: Emphasize stealth tactics over loud approaches to protect your loot and maximize profits.
– Prioritize High-Value Items: Always aim to grab the most lucrative loot available during your heist.
– Expedited Escape: Use helicopters for a quick escape, as delays can lead to unwanted police encounters and diminished loot values.

By adhering to this comprehensive guide and employing strategic planning, coordination, and swift action, you can effectively complete the Diamond Casino Heist with a focus on maximizing your rewards. Whether you choose a Silent & Sneaky approach or opt for another method, careful execution will ensure not only the successful completion of the heist but also highest possible gains.