Painite, ruby, diamond, gold, lithium, black opal, blue garnet and jadeite are the most expensive minerals. Painite is one of the rarest minerals on the world, as only 25 crystals have been discovered. As of 2015, it sells for $60,000 per carat.
The price of rubies goes up dramatically with its weight and clarity; the largest known ruby weighs 18 pounds. Gold has retained high but fluctuating value for thousands of years, selling for around $1,200 per ounce in modern times. Blue is the most desired out of the garnet family with its transformation to a purple hue in response to incandescent light, with a price of approximately $1.5 million per carat. Red diamonds are steeper than that at more than $2 million per carat, but jadeite tops even red diamonds at $3 million per carat.