Full Idea
The supposition that a diamond or organism should truly have emergent properties is that they appear at certain complex levels of organisation, but are not explainable (even in principle) in terms of any more fundamental properties of the system.
Gist of Idea
Emergent properties appear at high levels of complexity, but aren't explainable by the lower levels
Source
Thomas Nagel (Panpsychism [1979], p.186)
Book Reference
Nagel,Thomas: 'Mortal Questions' [CUP 1981], p.186