Above: The Vinci Diamond, patented by Israeli designer Shlomo Cohen. What makes this diamond different from any other diamond is the cut. Cohen based it on the "golden ratio," also commonly referred to as the divine proportion, which not coincidentally also features prominently in The Da Vinci Code.
While Christians are protesting the theological content of the book and film, mathematicians have a beef of their own: "In an apparent blatant misunderstanding of the difference between an exact quantity and an approximation, the character Robert Langdon in the novel The Da Vinci Code incorrectly defines the golden ratio as exactly 1.618 (Brown 2003, pp. 93-95)."
Looks like poor (ha!) Dan Brown can't catch a break.

Oh, man. I must have forgotten that bit of The DaVinci Code. But that diamond's really pretty.
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