Simply sign up to the Tiffany & Co myFT Digest -- delivered directly to your inbox. It is time to redefine one of the best-known clichés in the English language. “A rough diamond” imputes true beauty ...

A diamond rush that brought thousands of impoverished South Africans to a village with picks and shovels turns out to have been sparked by very common and not very valuable quartz crystals. “The tests ...

Kwa-Zulu Natal, South Africa — As word spread that there were diamonds to be found beneath the soil in a tiny, rural village in South Africa's Kwa-Zulu Natal region, thousands of people descended with ...

The hopes of thousands who rushed to a rural South African village last week in search of diamonds have been crushed, after government officials said Sunday that the stones were only quartz, which ...

West Coast startup Diamond Foundry is ushering in a new precious-mineral rush in California—this time for clear, undetectably lab-grown diamonds made by plasma reactor technology that mimics the outer ...