Natural Diamond-A Definition. By definition, a natural diamond is a diamond which originates in the earth, and was mined from the earth. The term natural refers to the creation process of the rough diamond material-which has to naturally occur in the earth over millions of years without human intervention.
Lincoln Square, Manhattan. Lincoln Square is the name of both a square and the surrounding neighborhood within the Upper West Side of the New York City borough of Manhattan. Lincoln Square is centered on the intersection of Broadway and Columbus Avenue, between West 65th and West 66th streets.
The sculpture was the artist's idea, not the city's. In an act of  guerrilla art , he trucked it to Lower Manhattan and on December 15, 1989, installed it beneath a 60-foot Christmas tree in the middle of Broad Street in front of the New York Stock Exchange as a Christmas gift to the people of New York.