Add Bullion and Precious Commodities tracking (Ability to track by weight/ounce)

I saw previous suggestions but they didn't quite get the scope of what I was hoping for.

-One suggestion makes a request for tracking coins by ounce
-Another suggestion makes a request for adding Silver and Gold Bullion Coins

I second this.
I have bars of copper, gold, and silver from SD Bullion. I would like to be able to add these to track.

-Perhaps add option for people to track commodity by ounce or weight? In case if others have pieces that can only be tracked by weight rather than put into words (i.e. handmade silver earrings)