Key points
- In the midst of growing scrutiny, this Gems and Jewelry News report examines a case whose repercussions have moved well beyond the alleged smuggling itself, creating concerns over whether buyers can rely on the certificates, inscriptions and quality grades accompanying diamonds sold in the domestic market.
- According to accounts of the police investigation, diamonds were sourced from suppliers in India and moved to Hong Kong, which allegedly served as a consolidation and coordination point before the stones were transported into Vietnam.
- Vietnam’s diamond and jeweler industry has been shaken by the exposure of what authorities describe as a sprawling transnational smuggling network involving tens of thousands of diamonds brought into the country through clandestine channels.
Vietnam’s diamond and jeweler industry has been shaken by the exposure of what authorities describe as a sprawling transnational smuggling network involving tens of thousands of diamonds brought into the country through clandestine channels. The investigation, which stretches from Indian diamond suppliers through Hong Kong and into Vietnam, has raised serious questions about gemstone provenance, certification practices, customs controls and consumer confidence in one of Southeast Asia’s increasingly important luxury markets.
Image Credit: Bangkok Gems News
Vietnamese authorities allege that the network moved more than 30,000 diamonds into Vietnam over approximately two years, with the stones connected to transactions valued at more than US$57 million. The investigation has expanded to include alleged smugglers, jeweler traders and individuals connected with gemstone appraisal operations. In the midst of growing scrutiny, this Gems and Jewelry News report examines a case whose repercussions have moved well beyond the alleged smuggling itself, creating concerns over whether buyers can rely on the certificates, inscriptions and quality grades accompanying diamonds sold in the domestic market.
Diamonds Moved from India Through Hong Kong
At the center of the investigation is an alleged international supply chain linking India, Hong Kong and Vietnam.
According to accounts of the police investigation, diamonds were sourced from suppliers in India and moved to Hong Kong, which allegedly served as a consolidation and coordination point before the stones were transported into Vietnam. Authorities have identified an unnamed Indian national residing and working in Hong Kong as an alleged organizer of the wider operation.
Investigators have also identified 32-year-old Indian national Abhishek Deepak Patel as an important figure in the Vietnamese side of the alleged network. Vietnamese authorities have accused Patel of helping manage diamond inventory, domestic sales and proceeds generated from the operation.
Vietnamese national Trinh Quang Chung, 42, has meanwhile been identified by investigators as another alleged participant. Authorities say he travelled to Hong Kong to receive diamonds before transporting them into Vietnam.
The methods allegedly used to evade customs detection were remarkably straightforward. Diamonds were reportedly concealed in luggage, clothing and shoes and transported by air, taking advantage of the stones’ small physical size and exceptionally high value.
Reports citing the investigation indicate that one segment of the operation involved more than 28,000 diamonds being transported during 141 trips that initially escaped detection. As authorities widened the investigation to related cases and additional shipments, the overall number of diamonds linked to suspected illegal importation climbed beyond 30,000.
Certification Allegations Deepen the Scandal
The controversy has become particularly serious for the jeweler trade because investigators are not examining only how the diamonds entered Vietnam.
Authorities are also investigating allegations that identification and grading information attached to certain stones was manipulated after importation.
According to reports surrounding the case, original Gemological Institute of America, or GIA, laser inscriptions on some diamonds were allegedly removed and replaced with different identifying information. Investigators allege that false or altered certification information was subsequently used in connection with some stones, potentially presenting diamonds as having characteristics or quality grades different from their actual specifications.
Such allegations strike directly at the foundations of the modern diamond trade. Certification, traceability and independent grading are essential because consumers cannot readily determine many of a polished diamond’s characteristics without specialized equipment and professional expertise.
If inscriptions and supporting documents are manipulated, even experienced buyers can face difficulties establishing a stone’s history and whether the diamond presented for sale is genuinely the stone described by its accompanying documentation.
PNJ Laboratory Personnel Draw Investigative Scrutiny
The widening investigation has reached individuals associated with PNJ Laboratory Co., the gemstone testing subsidiary connected with major Vietnamese jeweler retailer Phu Nhuan Jewelry.
Dang Ngoc Thao, identified in reports as a former director of PNJ Laboratory, was detained amid allegations concerning certification and alterations to laser inscriptions. Gem inspector Tran Tien Nhu Nghi has also been named in reporting on the investigation.
The involvement of personnel connected with a gemstone laboratory has intensified public concern because laboratories occupy a position of trust between jeweler sellers and consumers.
Phu Nhuan Jewelry has sought to distinguish the actions alleged against individuals from corporate policy and responsibility. Nevertheless, the investigation has generated substantial reputational pressure around the wider market and has demonstrated how rapidly confidence can deteriorate when questions arise over gemstone authentication.
SJC Also Drawn into Wider Investigation
Saigon Jewelry Company, or SJC, Vietnam’s prominent state-linked gold and jeweler business, has also been mentioned in reporting surrounding the expanding investigation.
Authorities have examined allegations concerning more than 3,400 lower-quality smuggled diamonds that were allegedly entered into SJC-related systems through transactions presented as customer repurchases.
The allegations are significant because the investigation is no longer confined to unidentified traders operating on the margins of Vietnam’s jeweler business. Instead, different strands of the inquiry have reached people or transactions associated with recognized names in the country’s jeweler ecosystem.
That development has amplified concerns among consumers over where diamonds originated, how their quality was established and whether documentation accompanying previously purchased stones can be relied upon.
Jewelry Company Directors Charged
Police investigations have also reached several local jewelry businesses whose directors have faced charges in connection with alleged purchases of illicit diamond inventory.
Among those named in Vietnamese media reports are Kim Ly Gold, Silver and Gemstone Co. Ltd., whose director Le Thi Ngoc My was charged; Ngoc Tam Co. Ltd., whose director Nguyen Thi Lien was charged; and NCA Investment Co. Ltd., operating under the Ngoc Chau Au name, whose director Hoang Thi Thanh Nga was also charged.
The allegations suggest that imported diamonds were distributed through domestic commercial channels, including to jewellery businesses seeking inventory at attractive prices.
Authorities continue to investigate individual responsibility, and charges or detention should not be interpreted as convictions. The distinction is especially important while proceedings remain active and investigators continue determining the roles allegedly played by different individuals and businesses.
Indian Nationals Feature in Related Airport Cases
The broader crackdown has also included Indian nationals accused in related diamond-smuggling activity through Tan Son Nhat International Airport.
Indian nationals Shah Hemantkumar Sureshkumar and Shaileshkumar Hareshbhai Prajapati have been identified in reporting concerning a separate or associated case involving more than 700 diamonds.
The emergence of several cases involving movements between India, Hong Kong and Vietnam has highlighted the international nature of diamond supply chains and the enforcement challenge presented by polished gemstones.
Unlike bulky contraband, diamonds worth substantial amounts can be concealed within extremely small spaces. That combination of portability, durability and high value makes customs enforcement particularly challenging and helps explain why international cooperation and reliable documentation are so important to the legitimate gemstone trade.
Unconventional Payment Methods Under Investigation
Investigators have also described an alleged financial settlement system designed to operate outside conventional banking channels.
Reports indicate that participants used messaging applications, including WhatsApp and Viber, to communicate about prices and transactions. Authorities have further alleged that serial numbers on physical US-dollar banknotes were used as identifying codes when coordinating payments.
Such techniques would allow participants to confirm counterparties or transactions without relying entirely on conventional bank transfers, potentially making financial flows more difficult to reconstruct.
For investigators, tracing money may consequently prove as important as tracing diamonds. Establishing how stones were purchased, who financed shipments, who received sale proceeds and where profits ultimately moved could help authorities determine the full scale and organizational structure of the alleged network.
Consumers Rush to Verify Their Diamonds
For Vietnam’s jewelry industry, however, perhaps the most damaging consequence has been the erosion of consumer confidence.
Reports from Ho Chi Minh City described worried customers approaching jewellery businesses with receipts and certificates and seeking verification, refunds or buybacks. Some smaller jewellery stores reportedly suspended operations temporarily as uncertainty spread.
Questions surrounding certification have created an especially difficult environment because diamond purchases frequently depend on long-term confidence. Buyers may hold stones for years as jewellery, family assets or stores of value, making confidence in documentation essential not merely at the point of purchase but also when stones are resold.
Major retailers have consequently faced increased scrutiny of their buyback practices and liquidity requirements as customers reassess purchases.
PNJ, one of Vietnam’s best-known jewellery businesses, experienced significant market pressure following developments in the investigation. Reports indicated that buyback activity placed pressure on liquidity and that limits were introduced on daily payouts as the company sought to manage cash requirements.
Regulators Increase Inspections
Vietnamese regulators have responded by increasing scrutiny of the jewelry trade.
The Ministry of Industry and Trade has reportedly initiated broader random inspections of major jewelry businesses, with authorities examining areas including product origins, taxation and labelling.
The regulatory response reflects a larger challenge: restoring confidence will require more than prosecuting individual smugglers.
Consumers and legitimate jewelry businesses need confidence that imported gemstones have passed through lawful customs channels, taxes and duties have been correctly handled, certificates accurately describe the stones to which they are attached, and laboratories operate independently and transparently.
Industry representatives have consequently called for structural changes to gemstone certification.
Among proposals receiving attention is the establishment of an independent domestic gemstone certification authority that could reduce reliance on appraisal systems closely associated with individual commercial businesses.
A Warning for the Wider Asian Diamond Trade
The Vietnamese investigation carries implications beyond the country itself.
India is the dominant global center for cutting and polishing diamonds, Hong Kong remains a major jewelry trading and logistics hub, and Southeast Asia represents an increasingly important luxury consumer market. The movement of diamonds among these centers is therefore a normal feature of legitimate international trade.
The challenge for regulators is distinguishing lawful commerce from shipments deliberately structured to avoid customs controls, taxes or disclosure requirements.
For established jewelers, the episode reinforces the importance of rigorous know-your-supplier procedures, inventory documentation, independent laboratory verification and auditable sourcing records. A competitively priced diamond can become an enormous liability if its provenance, grading report or customs history cannot withstand scrutiny.
The case also illustrates why a grading certificate should not be treated as merely another sales document. Its credibility depends upon the integrity of the laboratory, the ability to match the certificate unequivocally to the physical gemstone and safeguards preventing identifying information from being removed or fraudulently reproduced.
Trust Will Be the Industry’s Most Valuable Commodity
Vietnam’s diamond market now faces the difficult task of rebuilding confidence while investigators continue establishing the complete scale of the alleged network and the responsibilities of those involved. The reported movement of more than 30,000 diamonds demonstrates how vulnerabilities at sourcing, customs, certification and retail levels can combine to create consequences far greater than the value of the illicit shipments themselves.
For consumers, retailers and gemstone professionals, the affair is a powerful reminder that provenance and independent verification are fundamental to a functioning diamond market. Stronger inspection systems, transparent laboratory practices, better traceability and tighter cooperation among India, Hong Kong, Vietnam and other trading centers could ultimately emerge from the scandal. Until investigations and prosecutions have run their course, however, authorities and the jewelry trade will face the formidable challenge of separating legitimate stones and businesses from those touched by alleged illicit activity—and restoring the confidence on which the entire diamond business depends.
References:
https://www.channelnewsasia.com/asia/vietnam-diamond-smuggling-pnj-jewellery-6255416
https://thevietnamweekly.substack.com/p/the-huge-diamond-smuggling-case
