The Lightbox Autopsy: How De Beers' Lab Diamond Strategy Failed
De Beers launched Lightbox in 2018 to contain lab grown diamonds. It built a factory, lost over $100 million in a single year, briefly sold engagement rings, retreated in embarrassment, and shut the brand down in May 2025. This is the complete post mortem.
When De Beers CEO Al Cook was asked by The New York Times whether Lightbox achieved its strategic goals, he answered: "Kind of."
That answer is worth sitting with. A company that spent approximately $90 million building a production facility, lost $101.3 million in a single year, and ultimately shut the entire operation after seven years of operation answered a question about success with "kind of." It is either the most honest two word corporate assessment in recent memory, or the most revealing. Depending on how you read De Beers' strategy from 2018 to 2025, it may be both.
Lightbox was not a product launch in any conventional sense. It was a market intervention. Understanding what De Beers was actually trying to do, why it failed, and what the failure reveals about the diamond industry explains more about where lab grown diamonds are headed than any market forecast.
What De Beers Was Actually Trying to Do
De Beers launched Lightbox on September 6, 2018, with a price point that was, as JCK described it, "then shocking": $800 per carat, flat, regardless of size or quality. The flatness was deliberate. De Beers was not trying to build a premium brand. It was trying to establish a price ceiling.
The strategy had four distinct objectives, none of which were publicly stated in those terms at the time.
Objective 1: Collapse Lab Grown Prices
In 2018, lab grown diamonds were priced as a modest discount to natural diamonds, often 20% to 30% below comparable natural stone prices. De Beers believed that by entering the market at $800 per carat with the weight of its brand and production capability, it could drive competitors to race to the bottom. The theory was that if lab grown became permanently cheap, it would stop threatening the premium positioning of natural diamonds. Wholesale lab grown prices have since fallen 90%, per De Beers' own closure announcement. De Beers takes credit for this. Whether it deserves the credit, or whether the price collapse was going to happen anyway as Chinese and Indian producers scaled CVD manufacturing, is a more complicated question.
Objective 2: Keep Lab Grown Out of Bridal
Lightbox explicitly avoided engagement rings. The brand sold fashion jewelry. The reasoning was clear: if lab grown diamonds could be associated with weddings and commitment, they would threaten the category that drives the highest margin, highest volume natural diamond sales. By positioning lab grown as fun and fashionable rather than romantic and permanent, De Beers hoped to protect the bridal market from disruption.
This objective failed completely. Competitors read De Beers' lab grown entry as legitimizing the category, not limiting it. Brands that were hesitant to enter lab grown engagement rings before 2018 interpreted Lightbox's launch as a signal that the market was real and growing. By 2024, lab grown diamonds accounted for over 45% of US engagement ring purchases, per BriteCo's November 2025 data.
Objective 3: Control the Narrative
Lightbox refused IGI and GIA certification for its stones. It priced identically regardless of quality. The message was deliberate: lab grown diamonds do not need gemological documentation because they are not gemstones in the meaningful sense. They are manufactured goods, interchangeable and commodified, more like a fashion accessory than a diamond.
This narrative strategy required consumers to accept a distinction that the science did not support. Lab grown diamonds are chemically identical to natural diamonds. IGI and GIA grade them using the same standards. Asking consumers to treat them as categorically different from natural diamonds while simultaneously admitting they were the same material was a tension the brand never resolved.
Objective 4: Gather Market Intelligence
This is the objective De Beers is least likely to discuss publicly but most likely to have valued internally. Running a lab grown consumer brand gave De Beers direct access to purchasing data, consumer preference research, and competitive pricing intelligence that it could not have gathered any other way. A $90 million factory and seven years of operations is an expensive research project, but not an irrational one for a company managing a multi billion dollar natural diamond business.
"De Beers could never decide if Lightbox was a real brand or an attempt to shape the market."
Seven Years of Strategic Drift
Lightbox did not fail in a single moment. It drifted toward failure through a series of decisions that each suggested De Beers was unsure what the brand was actually for.
Lightbox launches with stones up to 1 carat, priced at $800 per carat regardless of quality. No IGI or GIA certification. No engagement rings. Explicit positioning as fashion, not romance. De Beers invests approximately $90 million in a production facility in Gresham, Oregon. Industry reaction is split between admiration for the strategic boldness and concern that it legitimizes lab grown diamonds at scale.
Lightbox expands to sell loose lab grown diamonds and increases the size range available. The move acknowledges that the bridal market is growing with or without Lightbox's participation. The brand begins adding quality parameters, moving closer to the certification model it had explicitly rejected at launch.
Lightbox briefly tests engagement rings. Industry reaction is immediate and overwhelmingly negative. The move contradicts everything De Beers had said about lab grown diamonds being unsuitable for romantic commitment. De Beers retreats. Lightbox loses $101.3 million this year, up from $22.3 million in 2022, per JCK. The Oregon factory's construction costs are cited as a contributing factor.
De Beers announces it will stop producing lab grown diamonds for Lightbox at the Oregon facility, redirecting it to industrial applications under Element Six. De Beers CEO Al Cook is publicly noncommittal about Lightbox's future as a retail brand. Anglo American simultaneously announces it will sell or demerge De Beers entirely.
In a final effort to find a viable price point, De Beers relaunches Lightbox with its entry level pricing dropped to $500 per carat. Lab grown wholesale prices have continued falling. The lower price point does not generate sufficient commercial momentum. De Beers begins preparing for closure.
De Beers announces Lightbox will close. Lab grown wholesale prices have fallen 90% since 2018. Lightbox assets, including inventory, are sold to third parties. The Oregon facility operates exclusively for Element Six industrial applications. CEO Al Cook tells The New York Times the strategy "kind of" achieved its goals. The brand ceases operations.
Why It Did Not Work
The charitable reading of Lightbox's closure is De Beers' own: the brand succeeded in accelerating lab grown price compression, demonstrating the distinction between lab grown and natural diamonds, and generating consumer data. By that reading, Lightbox was a costly but effective tactical intervention, and De Beers shut it down when it had served its purpose.
The less charitable reading is more persuasive.
The Bridal Market Was Left Undefended
Lightbox's explicit refusal to enter the engagement ring market was its most consequential strategic error. De Beers believed that by staying out of bridal, it was protecting natural diamonds. In practice, it was leaving the highest growth segment of the lab grown market to competitors who had no such constraints.
Every direct to consumer lab grown brand that entered the engagement ring market from 2018 onward did so into a space De Beers had publicly declared off limits for lab grown diamonds. The declaration did not hold. It simply told competitors where the opportunity was. By 2024, lab grown diamonds held over 45% of US engagement ring purchases. De Beers' strategy to contain them in fashion had the opposite effect.
Multiple industry executives told JCK that Lightbox's launch increased acceptance of lab grown diamonds rather than limiting it. By entering the market, De Beers signaled that lab grown diamonds were real enough to require a strategic response from the world's most powerful diamond company. That signal reached consumers and competitors simultaneously. The company that had spent decades arguing that only natural diamonds were worth serious consideration had just launched a lab grown brand. The implicit message was the opposite of what De Beers intended.
The Certification Refusal Was Not Credible
Lightbox refused IGI and GIA certification because certification implied that the stones merited serious evaluation. Uncertified stones were fashion accessories. Certified stones were diamonds worth comparing, grading, and purchasing for significant occasions.
The problem was that consumers could walk into any other lab grown retailer and buy a fully IGI certified stone. The absence of certification at Lightbox did not make lab grown diamonds less credible. It made Lightbox specifically less credible. By 2021, Lightbox was adding quality parameters to its own products, acknowledging the pressure. By the time it briefly added something resembling reports, the damage to its positioning was already done. It had spent years arguing certification was unnecessary for lab grown stones, then quietly started offering it.
The Price Floor Could Not Hold
The $800 per carat flat pricing was designed to establish a price ceiling for the lab grown market. It failed because De Beers could not control the supply side. Chinese and Indian CVD producers scaled manufacturing independently of anything De Beers did. Wholesale lab grown prices fell not because of Lightbox's pricing strategy but because of industrial economics that no single company could reverse.
By the time Lightbox dropped to $500 per carat in late 2024, lab grown wholesale prices had already fallen far below that floor. Supermarkets in the United States were selling lab grown diamond jewelry at price points that made Lightbox look expensive. De Beers acknowledged this directly in its closure announcement, noting that "in the US, supermarkets are driving down lab grown diamond jewellery prices."
A containment strategy depends on containing something. De Beers could not contain a manufacturing process that had spread globally before Lightbox launched its first product.
"Lab grown was priced off of natural. In that time, LGD prices have fallen over 90%. If you went back to 2018 and asked my predecessors what they hoped to achieve, I think they would say it achieved what they thought it would."
De Beers CEO Al Cook, JCK, May 2025
What Lightbox Tells Us About Lab Grown Diamonds in 2026
The Lightbox autopsy is useful not just as corporate history but as a clear signal about where the lab grown diamond market stands and where it is going.
Lab Grown Diamonds Won the Bridal Market Argument
De Beers spent seven years and significant capital arguing that lab grown diamonds were not appropriate for romantic commitment. The market disagreed. The average lab grown engagement ring center stone grew from 1.31 carats in 2019 to 2.45 carats in 2025, per BriteCo's November 2025 data. Buyers are not choosing lab grown stones despite their significance. They are choosing them because of what the price decline makes possible: a dramatically larger, higher quality stone within unchanged budgets.
Certification Became Non Negotiable
Lightbox's refusal to certify its stones was the clearest signal of its intended positioning: uncertified fashion, not serious diamonds. The market moved in the opposite direction. By 2025, 85.9% of lab grown diamonds sold were colorless, and 35.3% were VVS clarity, per BriteCo data. Buyers were not treating lab grown as uncertified fashion accessories. They were selecting the highest color and clarity grades available with full IGI documentation. The market Lightbox tried to create did not materialize. The market Lightbox tried to prevent is the one that exists.
The Price Floor Is Now the Buyer's Advantage
The 90% wholesale price decline that made Lightbox unviable is the same decline that transformed what buyers can access. A 2ct solitaire engagement ring that would have cost $4,500 to $6,500 USD at a major retailer now starts at $1,355 CAD at Draco Diamond's April 2026 pricing. A 5ct solitaire, previously a five figure purchase at any credible source, is now $2,990 CAD. The collapse De Beers was trying to manage has become the consumer opportunity it was trying to prevent.
De Beers' CEO said Lightbox "kind of" achieved its goals. That qualification deserves credit. The brand did demonstrate that lab grown and natural diamonds could be positioned as separate categories, at least in theory. The price compression it helped accelerate did create a distinction between affordable lab grown and expensive natural, which is the bifurcation De Beers has always argued was inevitable. Whether that bifurcation saves De Beers' natural diamond business or simply confirms that natural diamonds are becoming a niche luxury product is the open question the industry is now working through.
Frequently Asked Questions
De Beers shut down Lightbox in May 2025 because lab grown wholesale prices had fallen 90% since the brand launched in 2018, making its flat $800 per carat pricing model unviable, per De Beers' own closure announcement. The company cited intensifying global competition from low cost producers in China and US supermarkets driving lab grown prices below Lightbox's cost floor. Lightbox lost $101.3 million in 2023 and $22.3 million in 2022, per JCK.
Lightbox was primarily a containment strategy rather than a genuine commercial venture. De Beers intended to collapse lab grown prices to protect natural diamond margins, position lab grown as fashion rather than romance to protect the bridal market, and use the brand to gather consumer intelligence. It priced stones at a flat $800 per carat regardless of quality, refused IGI or GIA certification, and explicitly avoided engagement rings until briefly and unsuccessfully testing them in 2023.
Lightbox lost $22.3 million in 2022 and $101.3 million in 2023, per JCK's reporting on De Beers' financial disclosures. De Beers also invested approximately $90 million building its Gresham, Oregon production facility. When asked if Lightbox achieved its goals, De Beers CEO Al Cook told The New York Times: "Kind of."
No. Lightbox's decision to avoid the engagement ring market left it open for competitors who interpreted De Beers' lab grown entry as legitimizing the category. By 2024, lab grown diamonds accounted for over 45% of US engagement ring purchases, per BriteCo's November 2025 data. The average lab grown engagement ring center stone grew from 1.31 carats in 2019 to 2.45 carats in 2025.
De Beers' Gresham, Oregon facility, built at approximately $90 million cost, was redirected to De Beers' industrial diamond subsidiary Element Six in 2024, before Lightbox's full closure. Element Six produces synthetic diamonds for industrial applications including semiconductors and quantum computing, markets De Beers views as having strong commercial potential independent of jewelry.
