brown or orange. The Most Expensive Pink Diamond in the World The Pink Star Diamond, a completely flawless gemstone, set a ...

Many are colorless, but most are pale shades of yellow; red, orange, green, blue, brown, and even black diamonds are also found. Raw, uncut stones lack the exuberance of jewelry-store gems and can ...

The world's rarest gemstone is made of kyawthuite, a transparent reddish-orange mineral that’s known ... A lot of people ...