In every specification except for the colour, which comes from graphite, black diamonds are the same as any other diamond. They are found mainly in Brazil and the Central African Republic.

Please share why black diamonds resonate so well with your brand and why you have decided to make it a hallmark of Alinka. “I have always had an affinity for linear design and monochrome minimalism.

The price of the colours rose by 3.9 per cent last year, the data shows, with canary-hued stones up by 4.6 per cent. Coloured diamonds make up less than one per cent of the market.

But diamonds only started becoming culturally synonymous with marriage after Tiffany & Co. introduced the modern engagement ring, with its now iconic six-prong solitaire setting, in 1886.

So when people—and, specifically, celebrities—call up coloured stones to play the main role in their engagement rings, we pay attention. Whether it’s a vintage-esque ruby surrounded by a halo like ...

Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter. Coloured gemstones are defying the downturn in price for diamonds as consumers look past cheaper man-made ...

Russian royal gems, rare coloured diamonds on Geneva auction block - Sotheby's. By Stephanie Nebehay. ... His yellow and black Nike shoes, U.S. size 14, are estimated at 25,000-35,000 Swiss francs.

Coloured diamonds are a billionaire’s best friend is not quite as catchy a lyric as Marilyn Monroe’s husky rendition, but it is fast becoming the theme tune for the world’s auction houses.