How about trekking as a rockhound after sunset? That sounds weird! In the dark. True, the miners of Egypt exactly did this to identify the beauty of the ‘Evening Emeralds’. Any guess on the gem name?

Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter. From the days of Cleopatra to the peak of the British empire, the colour of peridot made it a valued jewel.

The semiprecious stone, which is the August birthstone, is typically the same slime lime shade as the trending hue of the summer. By Victoria Gomelsky When the acidic lime color on the cover of “brat, ...