Actually @lake sorry I should have been more specific. Okay, gold for it's monetary history and as a hedge against inflation (1). Silver mostly as an industrial metal, now and future (2). And platinum, almost exclusively industrial (3).
(1) https://www.youtube.com/playlist?list=PLE88E9ICdiphYjJkeeLL2O09eJoC8r7Dc
(2) https://www.silverinstitute.org/silver-in-industry/
(3) https://platinuminvestment.com/supply-and-demand