Allotropes of carbon dispersion of light of diamond make it useful for both industrial applications and jewelry. Diamond is the hardest known natural mineral. This makes it an excellent abrasive and makes it hold polish and luster extremely well. No known naturally occurring substance can cut (or even scratch) a diamond, except another diamond. The market for industrial-grade diamonds operates much differently from its gem-grade counterpart. Industrial diamonds are valued mostly for their hardness and heat conductivity, making many of the gemological characteristics of diamond, including clarity and color, mostly irrelevant. This helps explain why 80% of mined diamonds (equal to about 100
The Hardest Part (Blondie song) progressing past several armed guards. It would be revealed much later in an interview, that the original working title for this song was "The Stiffest Piece". As with all songs on the album, a music video was produced to promote the single. It features Debbie Harry in a long dark wig wearing a dress designed by Anya Phillips, who also designed the pink dress featured on the cover of the band's 1978 album "Plastic Letters". The video was directed by David Mallett. US 7" (CHS 2408, February 1980) The Hardest Part (Blondie song) "The Hardest Part" is a 1979 song