The structure's cone-like shape was designed to reduce wind turbulence, yet there is only one piece of curved glass on the building: a lens-shaped cap at the very top.

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The Principality of Monaco coat of arms provided the inspiration for a circle of rhomboid-shaped cut rubies arranged on the cap of the writing instrument.

FORBES: The Montblanc Princess Grace Collection

The wraparound labels on conventional round bottles were difficult to read, so she designed a flat tube-shaped container that stood upright on its cap, with plenty of room for a large, flat label that could be read easily at a glance.

WSJ: When Simplicity Is the Solution

The cornerstone will be a mandatory "cap-and-trade" system to limit carbon emissions, currently being shaped with the influence of heavyweights like BP, General Electric and Duke Energy.

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The piece is topped with a heart-shaped hole of the gold nib and the finely engraved Princesse Grace de Monaco monogram on the cap-top.

FORBES: The Montblanc Princess Grace Collection