A newly studied rough diamond from Botswana looks as if it has split in two, with one side pink and the other clear. The stone weighs 37.41 carats, measures about 1 inch long, and stands out as the ...

Experts at a laboratory in Botswana managed by the Gemological Institute of America recently examined an extraordinary natural diamond with two distinct color zones. When you purchase through links on ...

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 ...