First published by Money Metals here: https://www.moneymetals.com/news/2018/11/02/platinum-and-palladium-more-valuable-than-gold-001643

Gold is the metal of kings, the ultimate money, an eternal store of value, an untarnishable embodiment of beauty. Gold is all those things. But it is not the most valuable metal you can own on a cost-per-ounce basis. Often, platinum commands a higher price than gold. Lately, platinum has traded at an abnormally large discount to the yellow metal.