Figure 1. Left: 18K yellow gold “Flames” ring with 25.19 ct Mexican fire opal. Right: This 18K yellow gold “Spice” ring ...

They had unearthed a 4,500-year-old flint blade fragment — a rare Stone Age find — in the Kernmünsterland region, along ...

Among the many elements that make up the Earth’s crust, a select few are extraordinarily rare, existing only in trace amounts or under very specific geological conditions. This video explores the ...

The 10.38-carat gemstone, which carries an estimate of $3 million to $5 million, was owned by generations of European royalty ...