10 Most Expensive Materials in the World - Bullion For Less 10 Most Expensive Materials in the World | Page 6

Taaffeite
($2,500 per
carat)
It is a mauve-hued gem
made up of magnesium,
beryllium and aluminum. A
million times scarcer than
diamond and more durable
too, this explains the
gemstone's sky-high price.