Gadolinium is an rare earth / element that was first discovered in the 1800s by Swiss chemist Jean Charles Galissard de Marignac. The element has a multitude of niche uses.
The primary one and reasons for its investment value lie in its use in nuclear marine propulsion systems. Recent breakthroughs have lead to its application in mri machines, and cancer treatments. Further research in these areas makes gadolinium a very attractive investment for someone looking to hit a home run. At this time its price tends to hover around 480$ a kilogram, making it relatively cheap for a rare earth.