8. Ruthenium
At $263 per ounce, Ruthenium makes the list of one of the most expensive gems worldwide. It is highly desirable because of its capacity to withstand aggressive environmental and physical elements. Ruthenium is mostly produced in North and South America, Russia, Canada, and Ukraine. Besides its significance in jewelry making, Ruthenium is used on Palladium and platinum to make them harder.
7. Platinum
Platinum values at $894 per ounce. United States, China, Russia, Canada, South Africa, and Zimbabwe. The metal is heavy, versatile, and highly malleable. Its lustrous ability also puts in on the edge of making quality jewelry, dentistry cosmetics, weaponry, and aeronautics.