Heartlight is the first track on Diamond's 1982 album.
Once purchased by Sightholders (which is a trademark term referring to the companies that have a three-year supply contract with DTC), diamonds are cut and polished in preparation for sale as gemstones ('industrial' stones are regarded as a by-product of the gemstone market; they are used for abrasives)
In an atmosphere of pure oxygen, diamond has an ignition point that ranges from 690 C (1,274 F) to 840 C (1,540 F); smaller crystals tend to burn more easily

