Diamond is the hardest natural material known to man and the third-hardest known material after aggregated diamond nanorods and ultrahard fullerite. Its hardness and high dispersion of light make it useful for industrial applications and jewelry. Diamonds are specifically renowned as a material with superlative physical qualities ? they make excellent abrasives because they can be scratched only by other diamonds, Borazon, ultrahard fullerite, or aggregated diamond nanorods, which also means they hold a polish extremely well and retain their lustre. About 130 million carats (26,000 kg) are mined annually, with a total value of nearly USD $9 billion.[citation needed] About 100,000 kg are synthesized annually.[2] The name diamond derives from the ancient Greek adamas "Diamonds Are a Girl's Best Friend" is a song perhaps most famously performed by Marilyn Monroe in the 1953 film Gentlemen Prefer Blondes. In a later scene, Jane Russell, who played opposite of Monroe, sang "Diamonds Are a Girl's Best Friend" in court. Monroe's rendition of the song has been considered an iconic performance and since been copied by other entertainers ranging from Madonna and Kylie Minogue to Anna Nicole Smith. The song was also featured in 2001 film Moulin Rouge!, sung by Nicole Kidman. "Diamonds Are a Girl's Best Friend" was introduced by Carol Channing in the original Broadway production of Gentlemen Prefer Blondes (1949), which was written by Jule Styne (who also wrote the scores for such famed Broadway musicals as Funny Girl and Gypsy) and Leo Robin. "Shine On You Crazy Diamond" is an epic nine-part Pink Floyd composition with lyrics written by Roger Waters, in tribute to former band member Syd Barrett, and music written by Waters, Richard Wright, and David Gilmour. It was first performed on their 1974 tour.[1] It was recorded for the 1975 concept album Wish You Were Here. The song was intended to be a side-long composition like "Atom Heart Mother" and "Echoes," but the song grew longer than a single side of vinyl would allow. It was split into two parts and used to bookend the album. The name of the song is a reference to Syd Barrett: Shine on You crazy Diamond.

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