Deep blue stones are very rare and expensive, and found only in Brazil. Aquamarines are also found in Africa, Pakistan, Russia and Afghanistan. The Most Expensive Aquamarine in the World The most ...

The sample had secrets of its own — a new, rare metal previously unknown to science. Today, it's the most valuable precious metal on the planet: rhodium, a chemical element with the symbol Rh and ...

The sample had secrets of its own — a new, rare metal previously unknown to science. Today, it's the most valuable precious ... base metal and inclusion of gemstones, than the rhodium itself.

With fewer than 1,500 produced, the 1964 GT Hawk is one of the rarest of its kind. This particular example is one of only 46 ...