THCA (tetrahydrocannabinolic acid) diamonds are a type of cannabis concentrate known for their purity and high THC content. To be clear, THC diamonds are more accurately known as “THCA diamonds” because THCA is THC acid, the precursor to THC, the most abundant and intoxicating cannabinoid found in cannabis. THCA converts into THC after being exposed to high temperatures. Diamonds are another term for the crystalline structures that form in sauce, a cannabis concentrate with high levels of terpenes and a runny texture. Sauce can contain a mixture of both terpene-rich liquid and THCA diamonds. Further processing separates the THCA diamonds and refines them into crystalline THCA, a powdery concentrate comprised mainly of the cannabinolic acid.