gemstone

Underpinning this transformation has been Botswana’s huge diamond reserves - measured by their value, the country is the world’s largest producer of the gemstone.

Shaped and coloured like the country’s rare gemstone, tanzanite, the sparkling new railway terminal in Dar es Salaam is a symbol of Tanzania’s transport ambitions.

To grow the gem, Ms Boons started with a ruby "seed" taken from waste gemstone offcuts.

A grey and white piece of a cameo gemstone featuring Priapus - the Greek god of fertility - was posted by a user called "sultan1966" for just £40.

But as eye-catching as the Elizabeth Stewart dress was, all eyes were on Seyfried's matching platinum hair and gemstone headpiece, which resembled leaves on a vine.