What is Victorian Sea Glass? The Seaham Story and Why It Matters in Your Jewelry
Every once in a while, a material stops you cold. Not because it's flashy. Because it's real, in a way that most things aren't anymore. Victorian sea glass from Seaham, England, is that kind of material. Each piece spent over 170 years in the North Sea before arriving in my hands. What you wear isn't a bead. It's a frozen moment from the Victorian era, shaped by time, saltwater, and pure chance. This article tells the full story; where this glass came from, why Seaham is unlike anywhere else on earth, and how to tell the genuine article from the imitations flooding the market.
A Town, a Factory, and 170 Years at Sea
In 1853, a venture backed by the Marquis of Londonderry opened on the northeast coast of England. The Londonderry Bottleworks ,later known as the Candlish Bottleworks would become the largest hand-blown glass bottle factory in Britain, producing up to 20,000 bottles per day: perfume bottles, household glass, decorative wares, all shipped to markets across Europe.
Every evening, at the end of the day's work, the glassmakers did what the Victorians always did with their waste: they threw it into the sea. Molten scraps of different colors, pooled together at the bottom of crucibles that went weeks without cleaning, were discarded directly off the cliffs and into the North Sea. The workers called it "end-of-day glass." No one imagined it would still exist 170 years later.
The factory ran for nearly seven decades, until 1921. But the North Sea had already begun its slow, patient work, tumbling the glass shards against sand and rock, rounding their edges, leaching the lime and soda from their surface, frosting them into something that looked less like refuse and more like gemstones.
Then, in March 1917, a bottleboat called the Oakwell left Seaham harbor loaded with glass cargo, bound for London. It hit a German-laid mine in the North Sea. Four men were killed. The glass joined everything else already on the ocean floor.
The North Sea never gave it all back at once. It still doesn't. Each tide uncovers a little more.
What Makes Seaham Sea Glass Different from Any Other
Seaham isn't the only beach in the world where you can find sea glass. But it may be the only beach where sea glass became legendary.
The reason is the "Seaham Multi" pieces of glass that swirl with multiple colors in a single fragment: teal into aqua into white, amber bleeding into green, streaks of cobalt locked inside clear glass. These multi-colored pieces are the holy grail of sea glass collecting worldwide, and Seaham is one of only three known sources on earth for natural multi-colored sea glass of this kind.
The colors came from the decorative glass factories of nearby Sunderland, places like the Hartley Wood factory, which supplied the Victorians' appetite for highly decorated vases and ornamental glassware. The waste from these factories found its way into the current and drifted north to Seaham's beaches. Different chemicals produced different colors: cobalt for blue, copper for green, selenium for amber and orange. The rarer the original pigment, the rarer the piece you find today.
Rare colors red, orange, true cobalt blue can command $100 or more for a single unset piece. And here's the thing about rarity that matters most: there is no new source. The factories are gone. The Victorians are gone. The glass that exists today is all the glass there will ever be. Every year, there is slightly less of it on that beach worn smaller by the sea, or carried away by the collectors who come from across the world in winter storms to hunt it.
What you hold in your hand is finite. That's not a sales argument. It's geology.
Real Victorian Sea Glass vs. Fake. How to Tell the Difference
The market for sea glass jewelry has a serious problem: most of what's sold as "sea glass" has never been near the ocean. It's glass broken with a hammer and tumbled in a machine, sometimes treated with acid to dull the surface, then sold at any price point, often at high ones.
Here's how to tell the difference :
The frosted patina. Genuine sea glass develops what collectors call a "C-shaped" surface texture ,microscopic abrasions from decades of contact with sand and saltwater. This isn't a finish. It's a chemical process called hydration, where the ocean slowly leaches minerals from the glass and rebuilds its surface. It takes a minimum of 20 years to begin. You cannot fake it. Under a loupe, real sea glass looks alive, pitted, variable, almost sugary. Fake glass looks uniform, satiny, dead.
The shape. Real sea glass is never perfect. No two pieces break the same way, and no two pieces weather the same way. If you see a matching pair of "sea glass" earrings with identical oval shapes and identical frosting, that's a machine. Genuine pieces have irregular edges, varying thickness, and organic contours. The imperfection is the proof.
The color. Genuine colors are always slightly muted, aged by time and water. Fake sea glass tends toward vivid, commercial shades designed to catch the eye in a photograph. If it looks too bright, it probably isn't real.
The thickness. Victorian glass was hand-blown and significantly thicker than modern glass. Older pieces tend to be heavier, more substantial. Some will have small air bubbles trapped inside, a signature of the hand-blowing process that no factory replicates.
The provenance. A credible seller can tell you where the glass came from. Not just "from the ocean." From which beach, from which era, sourced how. If that information doesn't exist, there's a reason.
The International Sea Glass Association (ISGA) maintains a list of members who pledge to work only with genuine, unaltered sea glass. It's a useful reference when buying.
From the North Sea to Your Wrist. How I Work with Seaham Sea Glass?
Working with Victorian sea glass from Seaham is the most demanding part of what I do.
Everything happens slowly, and under water. That's not metaphorical : I drill each piece submerged, at the lowest possible speed, with the slightest possible pressure. Glass responds to heat the way it always has: badly. Modern drill bits generate friction. Friction generates heat. Heat creates stress fractures. And Victorian glass, already 170 years old and carrying the memory of a North Sea, does not forgive impatience.
About 20% of the pieces I work with break during drilling. I've accepted that. It's part of the truth of the material. When I select a piece, I hold it up to light for a long time, checking for hidden cracks, reading the surface, understanding what the North Sea has already done to it. I reject anything that doesn't feel right, even if it's beautiful. Beauty that breaks isn't finished.
Once a piece survives the drilling, once that tiny hole exists without a fracture it's solid. The glass that makes it through is tough in a way that's hard to explain. It's already survived 170 years. A little more time isn't going to be a problem.
What I won't do is force a piece into a setting it doesn't fit. Each piece of Seaham sea glass tells me what it wants to be: a pendant worn alone, a paired earring, part of a cascade. I don't decide. I listen.
The Four Seaham Sea Glass Pieces I Make
Because of the time each piece requires — and because of how much I reject, I only work with Seaham sea glass in four forms.
The Sea Glass Cluster Necklace is the most dramatic: a cascade of hand-drilled Victorian sea glass pieces suspended from premium kangaroo leather, each fragment different in color and shape. No two are alike. It's the piece people stop to ask about.
The Sea Glass & Pearl Necklace pairs Victorian sea glass with silver Tahitian pearls on hand-knotted leather, two materials from opposite ends of the earth, both shaped by the sea.
The Sea Glass Bracelet is built around a single exceptional piece selected for its frosting, its weight, its history. Minimalist by design, because the glass is enough.
The Sea Glass Earrings are the rarest offering. Finding two pieces that are similar enough to pair in size, weight, and frosted surface without being identical takes time I can't always find. When I have pairs, I make them. When I don't, I don't.
FAQ
How long does it take for genuine sea glass to form? At minimum, 20 years of ocean tumbling is required for the frosted hydration patina to begin developing. The Victorian sea glass from Seaham has been in the North Sea for over 150 years which is why its surface texture is so distinctive and impossible to replicate artificially.
Is Seaham sea glass still being found today? Yes, but in decreasing quantities. The Victorian glass factories that produced it closed over a century ago. Each tide uncovers a little more and each year, collectors carry a little more away. The supply is finite and will not be replenished.
What are the rarest colors of Seaham sea glass? Orange and red are the rarest, followed by true cobalt blue and certain shades of purple. The famous "Seaham Multis" pieces with swirls of multiple colors are among the most sought-after by collectors worldwide. Green, clear, and brown are the most common colors.
How can I tell if my sea glass jewelry is authentic? Look for an irregular, pitted frosted surface with subtle C-shaped marks not a uniform satin finish. The shape should be organic and imperfect. Genuine pieces vary in thickness and may have small air bubbles from the original hand-blowing process. If the pieces in a set are too uniform or the colors too vivid, they're likely machine-tumbled glass.
Why is Victorian sea glass from Seaham more valuable than other sea glass? Three reasons: provenance (a documented historical source the Londonderry Bottleworks, 1853–1921), rarity (one of only three known sources worldwide for natural multi-colored sea glass), and age (150+ years of North Sea conditioning creates a frosted surface depth unmatched by more recent beach glass). The history embedded in each piece is not reproducible at any price.
A Fragment of the North Sea, Worn
If you've ever picked up a piece of sea glass on a beach and felt that inexplicable pull that slight weight, that frosted opacity, that sense of something that used to be something else — you already understand why I use it.
Victorian sea glass from Seaham is the most demanding material I work with and the one I'm most reluctant to sell, because once it's gone, it's gone. Every piece that leaves my studio is the last of its kind.
If you'd like to see what's currently available, you'll find the full collection here: Seaham Victorian Sea Glass Jewelry — Trésors de St Barth.
Written by Ted Deltour, artisan jeweler and founder of Trésors de St Barth. Member, Cultured Pearl Association of America (CPAA). Graduate, École de Joaillerie de Montréal.
