- "We got intel on a shipment of diamonds moving through Paleto Bay. Ron's been looking for some rocks to focus a Lazer he's building to shoot down alien crafts, we could also just sell 'em. Either way, they're very important for the future of TP Inc. We'll pay well and fairly. There's a boat at the Paleto jetty you can use to get away."
- — Description
Trevor informs the team that a shipment of diamonds is moving through Paleto Bay and the diamonds would be important to the Trevor Philips Enterprises. The diamonds are situated behind few stores near a pier. Members from a rival crew will be protecting it so the team needs to eliminate the heavily armed members to get the diamonds. Afterwards, the team needs to deliver the diamonds by boat to the drop off point under a bridge connecting North Chumash to the Chiliad Mountain State Wilderness.
- Steal the diamonds.
- Take the diamonds to the jetty.
- Get in the boat.
- Take the boat to the drop off.
- This mission's name is a parody to the James Bond film: Diamonds Are Forever. Although, the name of this mission may also be a reference to the main element of Grand Theft Auto IV and its episodes, the Diamonds.