Liquid diamonds are melted diamonds. When D9-THCa diamonds are melted to make liquid diamonds, they decarboxylate (active) and turn into D9-THC. So the molecule for liquid diamonds is D9-THC. This recent innovation turns 98%+ THCa diamonds into vape ready oil with maximum purity. • Under certain conditions, THCa in a cannabis oil naturally presses together and hardens into rocks of THCa, much like how jewelry diamonds are made.