Detecting diamonds themselves in very low concentration is challenging. Diamonds are rare and small, their dielectric / electrical / physical difference from surrounding rock might be subtle at the scale of ADR’s resolution.
Here's a laboratory experiment that showed it was possible to observe the difference between lamproite and limestone samples using ADR harmonic energy images in core samples from the West Kimberley region of Western Australia.
EXPERIMENT REPORT: SPECTROSCOPIC PROPERTIES OF LAMPROITES AND LIMESTONE ROCKS
