1 gram of pure THCa diamond dust. Add a scoop or two to your favorite ground flower and increase the potency of your bowls, bongs or joints. But, go easy on it, a little goes a long way! THC diamonds, also known as THCa diamonds, are one of the most potent cannabis concentrates available. These crystalline extracts consist of nearly pure THCa, the non-psychoactive precursor of THC, which converts into THC when heated.