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Hello and welcome to Business Daily from BBC World Service. I'm Leslie Kerwin.

Today I'm in the glamorous jewellery district of Hatt and Garden in London to see how the

jewellery world is being reshaped by the mass production of laboratory-made diamonds.

There is a wonderful flash and glitter in the windows of all the shops here.

And a few years ago you could have safely assumed that all these diamonds had been dug out of the ground.

Now, it's true that some of them have been created at unbelievably high temperatures in just a matter of weeks.

If you take a mined diamond, then you would use something like 160 kilos of CO2.

When you produce a lab credit diamond, you use something around 8 kilos, so it's less than 5% of the CO2 emissions.

Those claims of sustainability have helped man-made diamonds disrupt an 87 billion dollar global jewelry industry.

75 years ago, the most famous diamond company of all Debears coined the hugely

successful slogan, A Diamond is Forever. Well, the newcomers will last just as long, they're much

cheaper, and they're being marketed to a new and younger audience. Pretty Gupta has been to Surat,

an Indian city which polishes the majority of the world's diamonds,

to meet Sanket Patel, director of Green Lab Diamonds.

The group itself is a 50-year-old group, which we were doing Mine Diamond earlier,

but 2017 we cut down the operation of Mine Diamond and move towards lab-grown diamond 100%. Being from

a diamond year family, when we

saw the product, you know, it's really surprised

us because if we cannot differentiate

...