Sea Glass 101

During a recent visit to Canada, old friends took us beachcombing on the Northumberland coast of Nova Scotia. There, I received a practical course in sea glass hunting. Neither I—nor my friends, the experts—found amazing museum-quality pieces, but we picked up handfuls of pebbles, shards, and even grains in a variety of beautiful colors—white, aqua, amber, and rarely, cobalt. Enough to fill a small Ziploc bag anyway.

Right now, I’m writing a section of The Search for Rose Michaud, my latest book project, which features sea glass collecting among other heritage seaside elements. In my deep dive into the subject, I’ve discovered its fascination. Sea glass connects to bottle and glass collecting in general, as sand and other materials are melted into glass…and then tumbled by wave action into coarse sand and gravel again.

Mary Beth Beuke’s excellent and gorgeous book, The Ultimate Guide to Sea Glass, educated me last year from a know-nothing to a know-a-little-something in Sea Glass 101. Enough to realize that there’s much more to the subject than looking for pretty pieces of glass.

Time in a Bottle

Not all sea glass derives from broken bottles, of course, but much of it does. Beuke compares the story of a sea glass specimen’s journey to “beach archeology.” Identifying its origin “creates a challenge between history’s truths and one’s imagination.”

“Sea glass is ‘just glass,’ like diamonds are ‘just rocks.’” –Unknown

That ruby vintage glass, polished and frosted by ocean tumbling, may once have been a schooner’s lantern, possibly washed up after a shipwreck. Perhaps the violet one began as an electric insulator in the Great Lakes, the cobalt stem as a bottle stopper in an apothecary’s shop. This mustard yellow sliver catches my eye, as does the creamy citron pinhead.

You can tell the seafoam-green lip piece comes from the days of glass Coke bottles, the amber one from a beer or oil container. The dark-green chunk held wine. A curved olive-green specimen could have been a Nova Scotia fisherman’s glass float.

Many fine old sea glass collections, such as my character Rose’s, contain a stunning variety of colors, but the rare shades such as red and pink, turquoise and cobalt—the most coveted—are becoming more and more scarce. Most of what I found on my beachcombing trek are the common snow white, bottle green, and brown.

So, even though sea glass collecting has soared in popularity over the past twenty-five years, its followers now have to search long, hard, and often to grow their hobby. Why?

As I wandered the Northumberland beach, my frequent question back home in Chile returned: Why is there so little sea glass there…or here now?

Location, Location, Location

That’s the key that influences the hunt most—location. What we call sea glass forms from any piece of glass subjected to submersion in sea or lake water and tumbled by waves and tidal movement. One of the best locations to find sea glass is where a river meets the sea. Dramatic tidal fluctuation on rocky shores also makes a huge difference.

The Northumberland coast we hiked lies within sight of Confederation Bridge, the modern link to Prince Edward Island. It’s on the north side of the land strip connecting the Nova Scotia peninsula to the mainland. To the south, the Bay of Fundy sweeps past Maine and dashes our Annapolis Valley coastline—formerly French Acadie—with the world’s highest, most extreme tides.

And therefore…some of the world’s best beachcombing too. Forty years ago I picked up hunks of amethyst off Cape Blomidon’s sheer cliffs as you would scavenge stones today. Sea glass abounds.

“…A poor simple sailor just like me,
Must be tossed and turned in the deep dark sea.
Farewell to Nova Scotia, the sea-bound coast,
Let your mountains dark and dreary be.
For when I am far away on the briny ocean tossed,
Will you ever heave a sigh or a wish for me?”
–“Farewell to Nova Scotia,” adapted from The Soldier’s Adieu, by Robert Tannahill

Rocky beach terrain and severe weather, both common to these North Atlantic climes, also factor into the transformation of bottle glass to sea glass. Sea Glass 101 teaches you that different types of beaches and ocean conditions will produce differing finishes as well. Fundy’s shores seem to create a more textured, frosty patina, favored by collectors above the silkier surface of beach glass from the Great Lakes and the Caribbean.

Down by the Shore

The northern two-thirds of Chile, on the other hand, has a relatively smooth, straight coastline, not serrated with deep inlets and bays like Maine, New Brunswick, and Nova Scotia. Its tides vary but little.

Beyond that, a rock-strewn or gravelly shore offers your best bet to discover sea glass. The pebbles “catch” the glass better than soft, open beaches.

Your best day or time of year is as soon as you can head out after a king (or perigee) tide, preferably in the early morning as the tide goes out. King tides, the highest and lowest of each season, represent the greatest range of ocean movement. Expert collectors tell us to walk along the strand line, the high-tide mark where heavier marbles tend to gather.

Or head out after a storm. Strong winds and waves churn up sand and gravel that has previously lain dormant. Storms bring those hidden gems to the surface and reveal them to us beachcombers.

Trash to Treasure

Old industries close to the shore, especially glassmaking but others as well, also contributed to a greater abundance of sea glass. In Sea Glass 101 we learn that on the bottom line, sea glass results from humans dumping garbage that contains glass. We—or our ancestors—sowed the oceans with “seed” glass.

Another clue to locating sea glass, then, is to seek areas of historic settlement and major marine traffic. Wherever lots of people have lived in the past, you will find the traces of their trash!

However, glass bottle production has slowed greatly since the 1970s. Perhaps unfortunately, though, the manufacture of uglier, disposable plastic containers and aluminum cans has increased.

While we can boast no shortage of plastics, Chile mostly pollutes farther inland and the bottom one-third of the country—where more sea-glass-friendly geographical formations exist—has virtually no industry at all except fishing.

Sea Glass Lovers are Beach Lovers

No wonder, then, that on my Chilean beaches I mostly encounter just seaweed, clam shells, wooden ice cream spoons, and paper straws. At least, with the advent of ecological awareness and green legislation, you rarely see plastic bags anymore.

Some beach lovers suggest bringing a trash receptacle with you on your beachcombing trek. This philosophy urges us leave the beach better—cleaner and tidier—than when we arrived. One local surfing school sets a superb example. They try to educate tourists about the coastal habitat and work hard on a shoreline restoration project. (Seashore 101 in action!)

Beyond the environmental conscientiousness, we beach lovers thrive in the freshness and beauty of the seaside ambience—and the solitude on an overcast day. We enjoy the thrill of the hunt for treasures and the history and mystery behind each specimen of sea glass discovered, large or small.

Genuine Versus Artificial

As the genuine article becomes more difficult to find, the joy of both rock and sea glass hunting has perhaps deteriorated into a hapless, half-hearted hobby, more of a chore than a challenge. Because…where has all the sea glass gone, even in areas where tides once sprinkled it lavishly?

In these days of fervent debate between advocates of the “real” and those of AI, some are planting the idea of “making” it ourselves, or at least jumpstarting the process by “sowing” pieces of glass on purpose. While I can understand the desire to preserve the delight of sea glass collecting for future generations, this option does seem to contract our new anti-littering sensibilities.

And modern glass seed just doesn’t possess the same backstory, nor has it made such a unique journey at sea. To the purist, art historian, and archeologist, this signifies an essential point.

But almost as soon as sea glass emerged into the spotlight a couple of decades ago, it rose dramatically in commercial value as well. Therefore, a multitude of imposters appeared on the scene. While beach glass can still be found all over the world, supplies of the genuine item dwindle, prices skyrocket, and faux baubles flourish.

Some ask: Is it truly sea glass if it originates from a workshop rock tumbler or a factory’s mechanized process or chemical bath?

While I would answer a resounding, “No, the real thing can’t be mimicked,” I confess to using fake glass in my décor due to the dearth where I live. Here’s how you can spot the difference:

–Shape/form.

The majority of sea glass pieces comes from historic bottles or tableware that was discarded or lost in natural disasters. They’ve probably traveled through the ocean for many years. Some of them may indeed be centuries-old antiques, but most likely date to less than 100 years. That’s because mass production of bottles began in the early 20th century, and glass then became common enough in the average home to throw away when it broke.

Thus, these pieces can be identified clearly as bottle parts—neck lines, rims, handles, or bottoms. Curvature also indicates bottle glass. True sea glass may even show embossed patterns, lettering, and numbers.

In the absence of such markings, mature sea glass is well-rounded and may resemble a marble more than an angular, sharp-edged shard. Otherwise, natural tumbling frequently produces triangular-shaped pieces, too.

Beware, the rough, blocky chunks are machine-made, chemically frosted pieces of glass. Whatever their size or form, another giveaway is their…

–Patina.

Genuine sea glass shows an elegant frosted, sometimes almost pitted, surface. It’s most often opaque; even the most common clear glass turns white. And it will be satiny and uniform in its textured finish.

On the other hand, machine-tumbled glass usually looks, well, glassy.

Small C-shaped patterns and hairline cracks sometimes appear on beach glass. This comes from the undersea process of hydration.

–Color.

Sea glass collectors seek the most beautiful colors, for sure. But some colors are extremely rare. You won’t find orange, red, cobalt blue, purple, true turquoise, black, or Vaseline yellow in any quantity…or at all, in some places.

So if you do… Guess what? You know it.

In a craft or garden store, nearly all colors are available in bulk, and the pricing between colors doesn’t reflect their rarity. That’s a sure sign of the artificial even if it’s labeled sea glass.

True Transformation

Which brings me to the question of real versus artificial transformation in my own life. The permanent versus the temporary, the deep versus the shallow, the long and hard versus the quick and easy.

Why don’t I find sea glass in my own life? Where is the transformed trash I’m hoping to discover?

Sea Glass 101 teaches that real sea glass has spent an epic life journey at sea and has stood the test of time and tides, storms and stones, wind and waves—often for decades. This gives it its smooth shape and exquisite texture. This makes it an item of value and significance.

What was once broken, discarded, unwanted, and tossed out as refuse passes through a lifelong maturation process to become highly desirable and prized.

Why is there no sea glass? Lord knows, I feel shattered and battered enough some days. The waves of circumstances hit hard. The journey of this life of obedience seems as monotonous as the tides. The winds grow rough and scary. Landing for good on home shore would be a welcome relief. The siren call to rest when others do tempts me. Sometimes I feel like I’m bumbling and tumbling all alone.

But I’m not perfectly polished yet. When I’m finished, the difficulties and disasters of this voyage will turn into delight.

The end is transformation, the promised joys of heaven’s shores:

“…Then we shall be where we would be, Then we shall be what we should be; That which is not now, nor could be, Soon shall be our own.” –Thomas Kelly, “Praise the Savior, Ye Who Know Him”

So our furlough trip and The Search for Rose Michaud took me first to a sea glass beach in Nova Scotia. You couldn’t find a better place to start.