In celebration of their centennial,Montblanc and Van Cleef & Arpels collaborated in creating “the Mystery, a writing instrument that will set you back a mere $730,000. Festooned with 840 diamonds and over 20 carats of gemstones, only nine are in existance, offering three variations of gemstones; rubies, sapphires or emeralds - all accented with diamonds, “set in a Van Cleef & Arpels patented “Mystery Setting”. This conceals gemstone settings and as a result an illusion is created which shows the emeralds, rubies and sapphires to be floating on its surface.”

via bornrich.org