Saffron: £10 per gram
The most expensive spice in the world, saffron costs between £5 and £10 per gram at the supermarket.
The spice is so dear because the process is labour intensive. Each flower produces just a few stigmas, which need to be hand-picked and dried before used with food. It can take around 150 flowers to produce a gram of saffron.
#4 & #7... Not sure what I am missing here.. But it seems that if I grind my solid gold bars up into a fine powder I can increase it's value by 700%.. from $28 to $200 a gram??