Beyonce & Jay Z: Screw Pineapples ... We're Pushing Lemons

Beyonce's working with sour accessories in Hawaii ... call it a sweet marketing ploy.

Bey and Jay Z are currently enjoying paradise beachside. Check out the pics ... Beyonce traded diamonds for a lemon rope. She's definitely got "Lemonade" on her mind ... in case that crown wasn't a dead giveaway.