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 ...

They come in hot pink. And red and orange. And a spectrum of greens. There is a watermelon variety, too, which is exactly ...

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