If we would be able to import all that diamond, diamond would be close to being worthless.
And everything would be so pretty!:D
But yeah, an expedition there assuming that we discover how to travel at the speed of light would take at least 80 years.
the crew would most likely die on the way there so it'd have to be a fully automated craft, which would probably break.
And even if it did get there then what? the temperature of the planet is estimated at 3900 degrees so it couldnt land!