Among the four major precious metals—gold, silver, platinum, and palladium—it is the most expensive and rarer than platinum.
Californium, a metal first synthesized in 1950, is the world's most expensive material due to its extreme rarity and its applications in medicine, industry and security. The metal, first ...
A stainless-steel Patek Phililppe Ref. 1518 could become the most expensive watch ever sold at the upcoming Monaco Legend ...