What’s the most expensive available, elemental material that you can buy? No, it’s not gold: as of September 7, gold was trading at $62.32 per gram, but lutetium costs $100 per gram, and californium (which has to be made) costs $27M per gram.
What about synthetic organic compounds? Surely, they can’t cost so much, can they? Well actually …. yes, they can. A quick search in MolPort’s comprehensive 7M+ database of available screening compounds and building blocks shows that the most expensive compound on file sells for $3995 per milligram, 64,104 times more expensive than gold on a weight-for-weight basis! Here it is: