Signet Stock And The Lab Grown Diamond Shift Investors Should Watch

Lab-grown diamond jewelry has moved from quirky niche to mainstream choice, and that shift is quietly reshaping where money flows in the stock market. Retailers with credible lab-grown offerings can see very different economics to those tied mainly to natural stones, which creates both opportunity and risk for you. This article breaks down three stocks linked to this theme and explains how this news could matter for your portfolio decisions.

The three lab-grown diamond jewelry retailers covered below are only a sample. The full screen on this theme surfaced 11 more listed businesses with equally detailed stories that are not included in this article.

If you want to move from ideas to a focused watchlist, head straight to the Lab-Grown Diamond Jewelry Retailers screener to identify, filter and analyze the highest-conviction opportunities in this corner of the jewelry market.

Brilliant Earth Group (BRLT)

Brilliant Earth Group sits right on the fault line of the lab-grown diamond shift, selling bridal and fine jewelry directly to consumers while leaning into ethical sourcing and man-made stones as a key part of its pitch.

Brilliant Earth Group is a direct-to-consumer jeweler that designs and sells engagement rings, fine jewelry and gemstones, generating about US$449 million from retail sales and carrying a market value of roughly US$139 million.

"The intensifying price competition from an abundance of high-quality lab-grown diamonds at structurally lower prices is accelerating, intensifying pressure on average order values and triggering margin erosion across the specialty retail jewelry sector, which will directly impact net margins and reduce profitability for Brilliant Earth."

This raises a key question: what happens if a single assumption about how much pricing power Brilliant Earth can hold in lab-grown pieces turns out to be wrong?

If that pricing assumption worries you, read the full narrative for Brilliant Earth Group to see how Brilliant Earth Group could still benefit if lab-grown adoption accelerates.

Michael Hill International (ASX:MHJ)

Michael Hill International is a familiar high street jeweler for customers in Australia, New Zealand, and Canada, and its diamond-heavy bridal and fashion range gives it clear room to lean further into lab-grown offerings as shopper demand tilts toward man-made stones.

Michael Hill International generated about A$658 million in jewelry sales and related services and has a market value near A$125 million, giving it meaningful scale for rolling out lab-grown ranges across a single branded retail network.

"Launch of exclusive branded and vertically integrated product offerings, including high-margin sustainable lab diamonds and personalized Pendant Bar concepts, enhances product differentiation and capitalizes on consumer trends toward branded goods and customization, providing upside to gross margins and boosting brand loyalty."

What really matters now is how one quiet shift in its product mix filters through to both pricing power and long-run profitability.

That mix shift is only the starting point, and the full narrative for Michael Hill International maps how Michael Hill International could turn lab-grown demand into accelerating cash generation and brand momentum.

Signet Jewelers (SIG)

Signet Jewelers is the heavyweight in this lab-grown diamond screen, using its Kay, Zales, Jared, Blue Nile and James Allen brands to lean into bridal and fashion pieces that feature man-made stones alongside natural diamonds.

Signet generates most of its roughly US$6.8b revenue from North America at about US$6.4b, with around US$423 million from International operations and about US$18 million from its Other segment, and the stock carries a market value near US$3.9b.

For investors tracking lab-grown jewelry as a theme, Signet matters because its size, brand reach and merchandising choices can influence how quickly shoppers embrace man-made diamonds at the counter.

"Significant growth in lab-grown diamond (LGD) fashion assortment (penetration doubled from last year to 14%) and focus on accessible price points ($200 to $500) position Signet to expand market share and increase revenue, while higher margin LGD products boost gross margins."

The real swing factor is how one pressure on jewelry pricing power plays out if shoppers eventually push back on higher ticket sizes.

If that pricing squeeze is the crux, read the full narrative for Signet Jewelers to see how Signet Jewelers could turn accelerating lab-grown adoption into an overlooked upside story.

Seeking Alternatives Before Momentum Flies

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.

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