Amber – $550/Kg

Most people don’t think twice about tree sap. Yet when that resin comes from ancient pine trees in a hardened form, it’s called amber, and it can be pretty valuable.

In fact, depending on the type of amber and the inclusions inside of it, this substance can set you back up to five hundred and fifty dollars per kilo. If you’re wondering what constitutes an ‘inclusion’, just think about the movie Jurassic Park and the insects it showed trapped inside a mold left behind by time. If your piece of hardened plant juice has a visible mosquito inside, you’ve hit the motherload.