What does he swam in the sea of diamonds mean in metaphor?

Oh, dude, swimming in a sea of diamonds in a metaphor means you're in a situation where everything around you is super valuable and precious, like, literally diamonds everywhere. It's like being in a dream where you're surrounded by bling, but, like, not really because diamonds are hard and you can't actually swim in them. It's just a fancy way of saying you're in a really fortunate or luxurious situation.