Diamonds carry a distinct meaning from other treasure in dreams because of a specific physical property: exceptional resilience under pressure — which usually points to a quality in yourself or a relationship that holds up even when tested.
Finding or receiving a diamond
Often reflects recognition — from yourself or others — of a quality in you that's proven resilient through a difficult period, something that didn't break under pressure that could have.
A diamond that's flawed or cloudy
Can reflect self-doubt about a quality you'd like to believe is unshakeable — worth examining whether that doubt is accurate or harsher than the reality.
Losing a diamond
A specifically anxious version, this often reflects fear of losing access to a resilient quality in yourself — confidence, a key relationship, or a hard-won stability.