The whole diamond industry is closing. PNJ is not allowed to.
QuietVC — July 2026
A small shop that closes loses one store.
PNJ closing for one day loses a 38-year moat.
That is why PNJ will carry the highest cost in the industry through this storm. And it may also be why they are the only one left standing afterwards.
Two weeks, one list
The story has outgrown a single business. It is now an industry story.
After the owners of Kim Ly, Ngoc Chau Au and Ngoc Tam were charged in a ring involving nearly 30,000 diamonds, stores under those brands shut simultaneously. Kim Chau, across the street and reportedly owned by a relative, closed too.
Then the wave spread to places with no connection to the case.
Thuc Lan Diamond closed its Ho Chi Minh City branch. Long Ngoc Luxury closed. Hoang Thu locked its doors with a temporary-closure notice. Kim Khiet An Dong put up a renovation sign. Cashion at Vincom Cong Hoa paused for two months to restructure. The Hong Phuc gold shop in Dong Thap suspended for two months. On Le Thanh Ton, three or four stores closed at once. On An Duong Vuong, many shops are still open with empty display cases.
The PJA stated the reason plainly, and it is the most important line in the whole news cycle: the suspensions did not arise from product quality, but from panic driving a sudden surge of customers bringing diamonds back to sell, beyond what the shops could handle.
Cao Hung has moved into a different phase. They have had to ask customers to accept payment delays of one to eight months, acknowledging that market confidence is being damaged by firms that took appointments and then stopped operating, which makes customers change their minds and demand immediate settlement.
One owner who had just closed summed it up in six words: "Buy a diamond and you lose."
This is a bank run, not a quality crisis
Name the phenomenon correctly and you can analyse it correctly.
No diamond spontaneously got worse over the past fortnight. The stones are unchanged. What changed is confidence, and with it the speed at which people want to turn stones back into cash.
The mechanism is exactly a bank run. The buy-back commitment is a short-term obligation callable at any moment. Inventory is a long-term asset, hard to liquidate quickly without loss. When every customer demands withdrawal at once, no model survives, including a healthy one.
That is why a perfectly clean business can still close in this storm. And it is why a store closing does not automatically prove guilt.
But it does prove something else: they did not have enough money.
A legal detail decides the whole game
This is the most important finding, and almost nobody is discussing it.
Product buy-back commitments are currently mostly civil agreements between business and customer, not mandatory legal obligations. And diamond and gemstone certification still has no unified regulatory framework, as gold does.
Translated into investment language, one sentence: a small shop can close its doors and walk away from the commitment. PNJ cannot.
Everything else in this piece follows from that.
The negative side: contagion is real
Do not celebrate for PNJ yet. Industry risk is shared risk, and it touches PNJ in two places.
The first is demand. "Buy a diamond and you lose" is spreading, and it is not a rumour, it is a conclusion. If Vietnamese consumers come to believe diamonds are no longer a store of value, then PNJ's diamond-related revenue, estimated at roughly a third of jewellery sales, faces a structural decline rather than a temporary shock.
The second is the balance sheet. If domestic diamond prices really fall, the diamond portion of the 13,419 billion dong inventory will need a write-down. In previous pieces, analysing inventory risk, I focused on gold and assumed it was the majority. The remainder, diamonds and gemstones, is now a more dangerous unknown than I had judged. And I still do not have a detailed inventory breakdown to calculate precisely.
Anyone saying this crisis is just a media story has not looked carefully.
The positive side: market share does not disappear
But turn it over, and there is something the crowd is missing.
When Kim Ly, Ngoc Tam, Ngoc Chau Au, Thuc Lan, Cashion and Hong Phuc all close at once, their customers do not disappear with the stores. Demand for wedding rings does not disappear. That market share has to flow somewhere.
It flows to whoever is still open, still has money, and still has a brand to lose.
PNJ has roughly 1,615 billion dong of net cash: cash plus short-term financial investments minus short-term borrowings. Debt to total assets of 27%. More than 430 stores. Its competitors have empty display cases and "closed for renovation" signs.
One more noteworthy move: the board resolution of 16 July approved engaging an international body for independent product quality certification, an independent audit of the entire process from import through purchasing, production and crafting to diamond sales, and an independent consultant to assess the risk management system.
A business with something to hide would not do that. It deserves proper credit. But discipline also applies: so far this is an intention. No firm named, no contract scope, no commitment to publish the results to shareholders. An audit report that stays in the board's drawer loses half its value.
What is happening, briefly, is that the industry consolidation tailwind I analysed before, which was expected to play out over years, is being compressed into weeks. Buffett calls this the moment the strong get richer from the crisis.
With one condition. They have to survive the crisis first.
The core asymmetry
This is the sharpest point of the whole story, and it comes from the legal detail above.
Because the buy-back commitment is only a civil agreement, a small shop can close and walk away. The cost to them is near zero; they had no brand to lose in the first place.
PNJ does not have that option. A listed company, a 38-year brand, whose moat is trust: PNJ must honour every commitment, even at a loss, even when nobody could force them to.
Which means that in the short term PNJ carries the highest cost in the industry while competitors default and run.
It sounds unfair. But that is exactly how a moat gets proven.
The Amex test, in its most precise form
In 1963 an American Express subsidiary guaranteed a salad-oil warehouse that turned out not to exist. Amex faced enormous obligations which, legally, it had good arguments to avoid. Many lawyers advised avoiding them.
They paid.
And that act of paying when they did not have to turned the scandal into living evidence of the brand's reliability. Buffett put 40% of his partnership into Amex, not because he had calculated intrinsic value precisely, but because he stood at a cash register in Omaha and watched people still pull out their Amex card.
PNJ's test today, it turns out, is not the question I posed last time, "will customers still walk in to buy a wedding ring?". The real question is narrower and much sharper:
Will PNJ pay every customer who brings a diamond back, with no default, no delay, no excuses, even at a loss, even while the whole industry defaults?
If yes: in twelve months PNJ will be close to the only trustworthy diamond brand in Vietnam. And a brand like that is valued in a completely different way.
If no, even one payment delay filmed and posted online, the moat is breached. And the entire financial analysis above, every figure about net cash and debt ratios, becomes meaningless.
The QuietVC lesson
There are periods when the financial statements cannot answer the most important question.
The balance sheet tells us whether PNJ has enough money to pay. It does not tell us whether PNJ will choose to pay. And in a crisis of confidence, the second one decides everything.
The data to answer that question is not in any report that will be published. It is at the cash register, in customer groups on social media, in whether a complaint appears that PNJ has rescheduled a payment. Anyone willing to watch there will know months before the market does.
Meanwhile a value investor does exactly what they do every week: take notes, and wait. This week's watch list gains two lines: whether the international audit result is published in full, and whether PNJ maintains uninterrupted buy-backs through July and August.
The whole industry is closing. Whoever is not allowed to close will either break, or inherit everything.
We will know within a few months. Not sooner.
Silent discipline. Compound value.