Photographs: Arnd Wiegmann/Reuters
Almost all of the diamonds that exist today began their journey more than one billion years ago in superheated molten rock and under intense pressure, hundreds of kilometres below the Earth's surface.
By the time they come to the retail market, they have to go through another journey across continents. An estimated 65 per cent of the diamonds originate in Africa and a good percentage of this is illegally acquired and sold.
The rough diamonds then travel to India or China for cutting and polishing. Finally, they end up in major diamond importing countries such as US and Israel.
Let's look at journey of diamonds in pictures.
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Diamonds' journey from sweat to smiles
Photographs: Goran Tomasevic/Reuters
An illegal diamond dealer from Zimbabwe displays diamonds for sale in Manica, near the border with Zimbabwe.
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Diamonds' journey from sweat to smiles
Photographs: Jorge Silva/Reuters
An aerial view shows an illegal mine in the jungle, south of Venezuela. Like African countries, Venezuela is also a major diamond producer.
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Diamonds' journey from sweat to smiles
Photographs: Finbarr O'Reilly/Reuters
Miners form a human chain while digging an open pit at the Chudja mine in the Kilomoto concession near the village of Kobu, 100 km (62 miles) from Bunia in north-eastern Congo.
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Diamonds' journey from sweat to smiles
Photographs: Reuters
Workers wash dirt and rocks in a river running through an open pit in Sierra Leone's diamond-rich eastern province.
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Diamonds' journey from sweat to smiles
Photographs: Jorge Silva/Reuters
Diamond and gold buyers wait for miners and customers outside a shop in Santa Elena de Uairen, south of Venezuela.
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Diamonds' journey from sweat to smiles
Photographs: Jorge Silva/Reuters
A miner pauses to smoke while working near the town of Ikabaru in the south of Venezuela.
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Diamonds' journey from sweat to smiles
Photographs: Siphiwe Sibeko/Reuters
A miner works underground in a Petra Diamonds diamond mine in Cullinan, outside Pretoria.
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Diamonds' journey from sweat to smiles
Photographs: Siphiwe Sibeko/Reuters
A truck unloads ore in a Petra Diamonds underground diamond mine in Cullinan, outside Pretoria.
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Diamonds' journey from sweat to smiles
Photographs: Gil Cohen Magen/Reuters
Israeli diamantaire Avraham Eshed uses a pair of tweezers to hold a diamond at the Israel Diamond Exchange in Ramat Gan near Tel Aviv.
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Diamonds' journey from sweat to smiles
Photographs: Baz Ratner/Reuters
An employee of Shefa Yamim diamond exploration company sifts through rocks in search of precious stones at the firm's laboratory in Acre, northern Israel.
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Diamonds' journey from sweat to smiles
Photographs: Joan Sullivan/Reuters
A view of a diamond cutting factory in Botswana's capital Gaborone.
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Diamonds' journey from sweat to smiles
Photographs: Arko Datta/Reuters
Employees work at a diamond cutting and polishing factory in the Surat in the western Indian state of Gujarat.
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Diamonds' journey from sweat to smiles
Photographs: Gil Cohen Magen/Reuters
Israeli diamantaires inspect diamonds at the Israel Diamond Exchange in Ramat Gan near Tel Aviv.
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Diamonds' journey from sweat to smiles
Photographs: Siphiwe Sibeko/Reuters
A visitor holds a 17 carat diamond at a Petra Diamonds mine in Cullinan, outside Pretoria.
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Diamonds' journey from sweat to smiles
Photographs: Francois Lenoir/Reuters
A worker inspects a 5.46 carat diamond before certification at the HRD Antwerp Institute of Gemmology.
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Diamonds' journey from sweat to smiles
Photographs: Fred Prouser/Reuters
A couple window shop at the DeBeers diamond boutique on Christmas eve on Rodeo Drive in Beverly Hills, California.
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Diamonds' journey from sweat to smiles
Photographs: Gil Cohen Magen/Reuters
A saleswoman is reflected in a mirror as she tries on jewellery at the Israeli Diamond Centre store in Ramat Gan, near Tel Aviv.
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Diamonds' journey from sweat to smiles
Photographs: Finbarr O'Reilly/Reuters
A Christie's employee places a necklace featuring the Evening Star, a 39 carat, D colour Golconda diamond, into a display case in New York.
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Diamonds' journey from sweat to smiles
Photographs: Arko Datta/Reuters
An employee at a diamond merchant's workshop inspects diamonds while grading them in Mumbai.
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Diamonds' journey from sweat to smiles
Photographs: Yuriko Nakao/Reuters
A man puts an engagement ring on a woman's finger during a photo opportunity at a jewellery store in Tokyo.
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Diamonds' journey from sweat to smiles
Photographs: Denis Balibouse/Reuters
A Christie's employee wears a sapphire (33.23 carats) and diamond ring by Repossi (centre), a 30.52 carat diamond ring (D color, Flawless) (left) and a Fancy Intense Yellow diamond ring (57.02 carats) during an auction preview in Geneva.
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Diamonds' journey from sweat to smiles
Photographs: Stephen Hird/Reuters
A model wears a diamond necklace by Cartier, estimated at 200,000 - 250,000 pounds (about $412,777 - $515,923), which formed part of the collection owned by Anne Moen Bullitt and will be sold in December's Fine Jewellery & Iconic Jewels from the 20th Century sale, at Bonhams auctioneers in London.
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Diamonds' journey from sweat to smiles
Photographs: Mike Blake/Reuters
Singer Alison Krauss wears $2 million dollar shoes, made out of Kwait diamonds and designed by Stuart Weitzman, as she arrives for the 76th Academy Awards in Hollywood.
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Diamonds' journey from sweat to smiles
Photographs: Toby Melville/Reuters
A staff member lifts the largest D color internally flawless diamond ever to appear at auction from its display box at Sotheby's auction house in London.
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