Science Diamond Strike

Science has found a $196,652,180,432,376,780,220,792,832 cache of diamonds.  That's 196 septillion and change for the science inclined.

The catch?  The diamonds are 100 miles down.

The deepest hole ever dug do date is the Kola Superdeep Borehole which was 9 inches in diameter, 7.5 miles deep and took almost 20 years to dig.

If someone does manage to drag them up you can assume all existing diamonds will suddenly become less valuable than common table salt.