On August 21, Lucara Diamond Corp. announced their discovery of a 2,492-carat diamond unearthed in a mine in Botswana. At that size, the precious stone is said to be the second largest rough diamond ...

Two samples of carbon crystals, which are clear and give off a kaleidoscope of spectral colours under direct sunlight, may appear to be identical. However, one is a billion years old, and the other is ...