Editor's note: You’ve probably seen the movie. “Blood Diamond” — starring Leonardo DiCaprio and his down-home Rhodesian accent — that delves into the dusty, deadly world of mining diamonds to finance conflicts in African war zones.

The film didn’t paint a pretty picture. But it did intensify the spotlight on the issue, which itself was reflective of real-world events like the Kimberley Process in 2000 — which drew governments and industry together in an effort to stem the savage trade.

But here we are a decade later and the buzz has died down. There is still talk about blood diamonds, but the multi-billion dollar global trade has hardly come to a grinding halt.

GlobalPost takes a look at how the ongoing ugliness ties the world together — from the raw diamond mines in Zimbabwe to India, where little-known middlemen polish the stones ‘til they shine on the shelf in Antwerp, hidden from view unless you know who to ask.

As long as diamonds are forever, blood diamonds will be too.

SURAT, India — This summer, the authorities in Surat, the commercial capital of the state of Gujarat, arrested two smugglers attempting to sell nearly a million dollars in so-called blood diamonds.

Close on the heels of similar busts, the arrest again raised fears that the chaotic conditions making this small city on India's Arabian coast the world's new diamond-polishing hub may also make it one of the weakest links in the fight to stop overlords from financing armies with the precious stones.

“Every month, diamonds are coming from Zimbabwe without a Kimberley Process Certificate (KPC),” said Kirti Shah, an elected official of the Surat municipal corporation who is also a diamond trader.

“But I'm the only person in the diamond market who will talk about it openly.”

Read more: Many African diamonds still bloody

Once known for processing small, cheap stones, Surat has gradually replaced Antwerp as the center for cutting and polishing nearly all of the world's rough diamonds — as local traders have invested heavily in technology and infrastructure to compete for large, flawless stones. (Antwerp remains a go-to for shoppers.)

Yet even as local factories have installed cutting-edge, laser-guided planning and marking software and the latest grinding and polishing machines, Surat's main advantage over polishers in Belgium and Israel remains its cheap labor force and a centuries-old, trust-based system of trading that keeps transaction costs low.

Every day, trading houses small and large rely on couriers to hand-carry millions of dollars worth of diamonds to Surat from Mumbai on local trains — with no protection but anonymity.

In Surat's markets, diamonds change hands on the street and zip back and forth across the city by motorcycle as traders haggle over prices. When a sale is finally made, nine times out of 10 the deal is done in cash, with nothing but a hand-written chit to record the transaction.

Last year, $30 billion worth of stones passed through this city, according to the Gem & Jewelry Export Promotion Council. That's 11 out of 12 of the world's diamonds.

And while there are no reliable estimates, it stands to reason that if nearly all of the world's legal diamonds make their way here, a good portion of the conflict diamonds do, too.

More: How Surat bounced back from the plague

“It's a very big market,” said a senior investigator in the local branch of the directorate of revenue intelligence — the outfit responsible for combating smuggling, counterfeiting and other economic crimes. “So many brokers are trading on the pavement itself. It's very difficult to monitor.”

Diamond traders say that local press reports claiming that conflict diamonds comprise 15 to 30 percent of the market (citing unnamed sources) have exaggerated the problem. But with some 5,000 polishing units — around 1,500 of them tiny cottage industries scattered throughout the state — it's patently impossible to track each and every stone.

“This not a problem only for Surat, or only for India. It's a problem around the world,” said Damji Mavani, secretary of the Surat Diamond Association, which conducts seminars and other programs to raise awareness about conflict diamonds.

According to the revenue intelligence officer, who is not authorized to be quoted by name in the media, Indian revenue officials have only been monitoring the diamond trade since 2008, because diamond imports are not taxed.

Since the authorities began tracking the business, however, they have already busted traders with three consignments of blood diamonds, each valued around $1 million or more. In September 2008, revenue intelligence officials arrested two Lebanese men — Robai Hussain and Yusuf Ossely — with 3,600 carats in rough diamonds worth around $875,000 at the time.

This April, they caught two Indians — Jora and Prema Desai — allegedly attempting to sell 48,000 carats of conflict diamonds from Zimbabwe worth more than $2 million. And in August, Indian authorities arrested an Indian trader named Pravin Ajudiya and a Congolese national named Jean Tshinaga with some 10,000 carats in alleged blood diamonds valued around $950,000.

More: Naomi Campbell to testify over blood diamonds

Writing in India Today magazine, journalist Shantanu Guha Ray recently cited local traders as saying that such conflict diamonds routinely come to Surat on dhows sailing from Dubai. But in each of the three cases broken by Indian officials, the alleged smugglers hand-carried the rough stones on international flights and were caught because of tips from local informants, the senior revenue official said.

“There may be many such carriers,” the revenue intelligence officer said. “But unless and until we get information, we cannot catch them.”

For opponents of the trade in conflict diamonds, India's frontier-style market presents a serious problem, mainly because the entire interdiction system hinges on documentation.

Since 2003, the Kimberley Process Certification Scheme has made it mandatory for diamond exporters to document every shipment of rough stones to certify that they do not come from conflict zones. According to the Diamond Trading Corporation — a subsidiary of De Beers, the world's largest diamond company — the scheme has ensured that blood diamonds account for less than 1 percent of the global trade, compared with 15 percent before there was any monitoring system.

But others are less sanguine about the certification scheme's success. Once a diamond is cut and polished, there's virtually no way to trace its origin, though a handful of retailers have tried to set up a method that would allow buyers to do so.

Meanwhile, the main market for cut diamonds is increasingly moving to countries like India and China, where the idea of “ethical consumerism” is even less common than it is in richer nations.

Last year, as the U.S. economy languished, around 70 percent of India's gem and jewelry exports went to diamond traders Hong Kong and the United Arab Emirates.

“Essentially, illicit diamonds that bypass the early stages of the Kimberley Process (such as those from Gabon and Cameroon, or those smuggled from Cote d'Ivoire, Venezuela, or Zimbabwe) can be laundered through willing companies in the cutting and polishing industry,” Ian Smillie, chairman of the Diamond Development Initiative, wrote in a recent report.

“Arrests and the seizure of uncertified rough diamonds in the United States, the European Union, India and elsewhere demonstrate what may be the tip on an iceberg, one that the [Kimberly Process] has been unwilling to acknowledge or deal with.”

Non-governmental organizations like Diamond Development Initiative, Amnesty International and Global Witness have repeatedly criticized the Kimberley Process for failing to plug loopholes in the system, and, worse, for failing to crack down on offenders like Venezuela, Guinea, Lebanon and Zimbabwe.

But faith in the Kimberely Process has recently fallen to a new low. Activists walked out of a key meeting in June in what Global Witness termed a “vote of no confidence” triggered by a deal to allow Zimbabwe to sell diamonds from its violence-plagued Marange fields that “does not contain sufficient checks and balances to prevent substantial volumes of illicit diamonds from entering the global diamond supply chain.”

According to India Today, the deal allowed the Surat Rough Diamond Sourcing India Limited, a consortium of 1,500 diamond traders, to directly source rough diamonds from miners in Zimbabwe, making it more difficult for the Kimberley Process to track the stones.

Last year, Surat Rough Diamond Sourcing India Limited and the Zimbabwe government signed an agreement for the regular supply of diamonds worth $1.2 billion a year in exchange for training Zimbabweans in Surat's diamond-processing units, the magazine reported in May.

Many of those stones will doubtless wind up in Surat's “Mini Bazaar” — a small outpost compared to the main market in Mahidharpura, where there are some 50,000 traders, according to a local broker.

On a typical weekday afternoon here, hundreds of diamond brokers line the street. Clad in the standard cheap polyblend slacks, button-down shirt and rubber sandals, they sit on the back of motorcycles and on stoops, lean against shopfronts or squat on their heels, farmer-style, on the curb.

Behind them, in open-air shops, dozens of traders sit cross-legged behind rows of tiny desks, examining sachets of glittering stones with tiny jeweler's loupes.

If the roughs they came from once had blood on them, nobody would be the wiser, judging from the way polished stones change hands.

“Hello, hello, gentleman,” a local trader calls out from behind a tiny desk. Keen to make a sale, he spills a sparkling pile of half-carat diamonds onto the table from a paper sachet.

“All the documents are in Mumbai only, so there is no need to look at them,” he says when asked whether they are legal. “We buy the diamonds on trust.”