Diamonds aren't always colorless; they can also be blue, yellow, green and even pink. But what makes these jewels come in varied hues? After forming, diamonds need to rise to the surface very quickly ...

Collectors lusting after the rarest of gems have a new kind to add to their list: diamonds that change colour when made extremely cold. These aren’t the first gems known to change colour: so-called ...

Ultra wealthy Indians are increasingly placing their bets on pink, blue and yellow diamonds, embracing the rare stones as both eye-catching statement jewellery and long-term investment assets.