If the measure of someone’s success is the envy and backbiting that accompanies it, Nirav Modi is well on his way to fame. Others in the business of fine jewellery claim he’s biting off more than he can chew, but the third-generation “old world cutter” of exceptional diamonds and chairman of Firestone Diamond has not shied away from setting some of the world’s rarest and most expensive diamonds and gemstones in pieces of jewellery that only a handful of people will be able to afford.