Jeweler Krishna Choudhary pulls out a box from his safe and then slowly opens the velvet case to reveal a mesmerizing 150-carat sky-blue star sapphire. The stone fits snuggly in the palm of my hand, ...

Forbes contributors publish independent expert analyses and insights. Kate Matthams Spencer is a Paris-based writer who covers jewelry. A pair of early 20th century oval gold bangles from Gujarat, ...