This is one of my all-time favourite icons.
I use this for conversations related to self-worth, self-discovery, self-value, etc. It's simple but I always find it very emotive. Even drawing it I can feel a warm in my core. The diamond symbol may also be replaced with a heart or other symbol that can also be used elsewhere in the same illustration as a short hand for the types of things one may be uncovering about oneself.
I love the thought of peeling yourself open, looking deep inside, and being pleasantly surprised by the treasures you find.