So you’ve spotted a frosted piece of glass on the beach and wondered what it was. Or maybe you’ve seen sea glass jewellery and thought, I’d love to find my own.
Either way, welcome. This hobby will ruin every beach walk you ever take, in the best possible way and people who don’t get it will totally think you are nuts. You’ll never stroll along a shoreline again without scanning the tideline. Your eyes will start doing it automatically. You’ll crouch down in the rain on a November morning and not even notice the cold because you’ve just spotted something blue.
You’ll never stroll along a shoreline again without scanning the wrack line.
I am pretty sure treasure hunting is ingrained in all of us. Once you start, it becomes the most addictive hobby, super fun, frustrating when you don’t find that elusive blue, but when you find your first multi, it’s a pretty special moment.
There can never be a bad day spent at the beach; it is good for the soul!
I’m Tasha. I’ve been hunting UK beaches for years, usually with my Jack Russell Trigger skidding around my ankles. This guide covers everything I wish someone had told me before my first proper hunt.
The good news is that sea glass hunting isn’t complicated.
The bad news is that most beginners are looking in the wrong places, at the wrong time, on the wrong beaches.
The difference between finding one piece in two hours and filling a pocket before lunch often comes down to understanding a handful of simple concepts:
- How tides move material around a beach.
- Why some coastlines produce far more sea glass than others.
- Where glass naturally accumulates.
- What genuine sea glass actually looks like.
- How to read a beach like an experienced hunter.
That’s exactly what this guide will teach you.
What actually is sea glass?
Sea glass is exactly what it sounds like: glass that’s been discarded into the sea, then tumbled by waves, sand and rock over decades until the edges are smooth and the surface is frosted. What starts as a broken bottle becomes something that looks like a precious stone.
The process takes time. A piece of genuine sea glass has typically been in the water for anywhere between 20 and 100 years. That frosted, pitted surface is what you’re looking for; if it’s still shiny or see-through, it’s just broken glass and not worth picking up. I like my glass nice and rounded. If it’s still jagged, don’t feel bad about throwing it back in; it probably needs another 20 years of tumbling.
Where does it come from?
Old dumping grounds, bottle factories, Victorian piers, shipwrecks, and coastal industry. That’s why some beaches are far better than others. The UK has brilliant hunting because of its industrial coastal history. Places like Seaham in County Durham sit atop what was once one of the largest glassworks in Britain, with waste glass tipped directly into the sea for decades.
One of the biggest mistakes beginners make is choosing beautiful beaches instead of productive ones. Sea glass comes from people. The best beaches usually have a story behind them: old harbours, Victorian resorts, glassworks, industry or centuries of maritime activity.
The older the history, the better the glass.
The most important thing: get the tides right
This is everything. Go at the wrong time, and you’ll find nothing.
The best time to hunt is just after high tide, as the water is pulling back ideally around one to two hours after high tide. This gives you a freshly washed beach with glass that’s been churned up and deposited, and you can walk the shoreline as it recedes.
Spring tides (around a full or new moon) move more water and bring up more glass. After a storm, it is also brilliant that rough seas churn up pieces that have been buried for years.
We have invested a lot of time into our Sea Glass Score app, which takes all the moon phases, time of year, wind, storms and a few other calculations to spit out a score for finding glass. It’s not perfect, nothing is, but it’s a great steer on what day to go treasure hunting.
Some beaches disappear completely when the tide is in. Make sure you always check times and set alarms on your phone. The sea is always stronger than you think, so never risk looking in one more rock pool, and never ever miss the cafe closing for a cuppa.
Check out the best SeaGlass Beaches this week for treasure hunting
What kind of beach to look for
Not all beaches are equal. Here’s what works in your favour:
Pebble beaches over sandy ones. Glass accumulates among the smaller stones, and sand swallows it. Look for shingle beaches, rock pools and areas where pebbles naturally collect.
Industrial or historical coastlines. Former ports, fishing towns, and anywhere near old factories or dumping sites. The glass has to come from somewhere.
Less visited spots. The more popular the beach, the more hunters have already been through it. Seaham is worth visiting because the volume of glass is genuinely extraordinary, but arrive early or accept you won’t have it to yourself.
Coves and pocket beaches. Natural inlets and coves trap glass that currents deposit there. These are often the best-kept secrets.
What to bring
You don’t need much. That’s part of why this hobby is so good.
- Sturdy footwear. Wellies or walking boots. Pebble beaches are harder on your feet than they look, and you’ll want to wade in slightly without ruining your shoes.
- A small bag or container. Something with a zip or lid so your finds don’t rattle around and chip. A small Tupperware works perfectly.
- A hand rake or garden tool. Optional but useful for turning over shingles and reaching into rock pools without wrecking your knees.
- Layers. British beaches are cold. Even in summer. You’ll be there longer than you planned, guaranteed.
- Small or Large dog, of course, is optional, but I can’t think of a more fun exercise with your best pal
How to actually spot it
Ok, so when you first arrive at a beach, you are going to say “where is all the glass?” and you are going to totally rethink this hobby as bizarre and impossible, but you need to train your eyes, it is easier to look maybe a metre ahead, and eventually you will see it everywhere. It is easier to spot in the wet pebbles, all shells look like sea glass, but in no time you can see a blue from far away!
Crouch down. This is the single biggest tip most beginners miss: sea glass sits low among pebbles, and you’ll walk straight past it standing upright. Get closer to the ground, and suddenly, pieces you couldn’t see become obvious.
Look for the frosted, matte surface against the shine of wet pebbles. On a sunny day, some colours will catch the light beautifully, greens, blues and browns especially. Look along the high-tide line, where lighter pieces are pushed furthest up the beach.
Pebbles will continually wow you with their colours. I can’t tell you how many I’ve picked up thinking they are glass.
Move slowly. This isn’t a walk, it’s a scan. The best hunters treat the beach like they’re reading it line by line.
I always think a piece of sea glass finds you not the other way around, i have been at beaches and countless people walk straight past lovely pieces that i find, and visa versa, everyone is looking with different eyes, it blows my mind, it’s important to remember this as even on a busy beach (Seaham) you will still find great glass, maybe not as much but it’s there.
What colours will you find?
Most of what you’ll pick up is green and brown old beer and wine bottles. White is common too. These are lovely, but they’re the everyday finds.
The rarer colours are where it gets exciting: deep blue, soft aqua, red, orange, yellow, pirate glass and black. Finding a genuine red or orange piece is genuinely thrilling. They come from old warning lanterns and vintage glassware, and they’re rare enough that experienced hunters will stop and stare.
Seaham is one of the UK’s most famous sea glass beaches and is home to the legendary “multis”. These multi-coloured pieces were created when glassworkers discarded mixed batches of molten waste glass into the North Sea. Swirls, stripes and unexpected colour combinations make them some of the most sought-after finds in the world of sea glass. Finding your first multi is a moment you’ll never forget.
More on colour rarity in a separate guide, but for now, collect everything. You’ll develop your eye for quality over time.
Learn to Read a Beach
One of the biggest mistakes beginners make is treating a beach as one giant search area.
It isn’t.
Sea glass doesn’t spread itself evenly across a beach. Waves, tides, wind and currents are constantly sorting material and concentrating it in certain places. Learn where those places are, and you’ll find far more glass without walking any further.
When I arrive at a new beach, I’m not immediately looking for sea glass. I’m looking for clues.
The Wrack Line
The wrack line is the line of seaweed, shells, driftwood and debris left behind by the previous high tide.
Think of it as the sea’s “drop-off point”.
This is often the first place I check because lighter pieces of sea glass can be deposited here as the tide retreats. Fresh storm deposits can also collect along the wrack line.
Not every wrack line is productive, but it’s always worth a quick look.
Pebble Ridges
If I could only search one area of a beach, it would probably be a pebble ridge.
These raised banks of pebbles are formed by wave action and serve as natural sorting machines. As the sea moves material around, sea glass often becomes trapped amongst the stones.
Work slowly and methodically. Some of my best finds have come from pebble ridges that other people walked straight past.
Groyne Bays
Groynes are the wooden, metal or stone structures built to reduce beach erosion.
The sections of beach between them are known as groyne bays.
Because waves and currents slow down around groynes, sea glass often accumulates here. I always make a point of checking around the base of groynes and the pebble bands that form alongside them.
Rock Pools
Most people look in rock pools for crabs.
Sea glass hunters look for treasure.
As storms and tides move material around, glass can settle into cracks, crevices and the edges of rock pools. They take longer to search but can produce some lovely finds.
Harbour Walls and Historic Structures
Old harbours, piers and sea walls are often overlooked.
Remember, sea glass comes from people.
Anywhere with a long maritime history is worth investigating. Historic harbour walls, fishing ports and old industrial coastlines can all be excellent hunting grounds.
Learn to Follow the Sea
The best sea glass hunters aren’t necessarily the people with the sharpest eyesight.
They’re the people who understand how the sea moves.
Ask yourself:
- Where is the tide depositing material?
- Where are pebbles collecting?
- Where is the beach naturally sorting objects by size and weight?
- Where would a piece of glass get trapped?
The more you ask these questions, the more sea glass you’ll find.
Eventually, you’ll arrive at a beach and instinctively know where to start.
And when that happens, you’ll realise you’re no longer just looking for sea glass.
You’re reading on the beach.
Common Beginner Mistakes
Don’t worry, we’ve all made these. Some of us have driven three hours to a beach, arrived at high tide, found absolutely nothing and then blamed the beach.
1. Hunting at the Wrong Time
If you remember one thing from this guide, remember the tides.
The best sea glass beach in the world can feel completely empty if you arrive at the wrong time. Check the tide times before you leave home and aim to arrive around one to two hours after high tide.
2. Choosing Beautiful Beaches Instead of Productive Beaches
A pristine sandy beach might look stunning, but sea glass isn’t interested in winning beauty contests.
Pebble beaches, old harbours, industrial coastlines and historic seaside towns are usually far more productive.
3. Walking Too Fast
- Sea glass hunting isn’t a race.
- Slow down.
- The best hunters move at a pace that would make most dog walkers question their life choices. The more slowly you scan, the more you’ll find.
4. Looking Directly at Your Feet
- This sounds strange, but it’s often easier to spot sea glass a metre or two ahead rather than directly below you.
- Train your eyes to scan. Once it clicks, you’ll suddenly start seeing pieces everywhere.
5. Expecting Rare Colours Straight Away
- Everyone wants a red.
- Everyone wants a multi.
- Most of us start with Stella green bottle glass.
- That’s completely normal.
- Collect everything at first. Your eye for quality and rarity will develop naturally.
6. Giving Up Too Soon
- Some days the beach gives generously.
- Other days it makes you work for every single piece.
- Stick with it.
- I’ve had beaches go from “absolutely nothing here” to “where did all this come from?” in the space of twenty minutes.
7. Ignoring Beach History
Sea glass comes from people.
The best beaches usually have stories behind them. Old glassworks, Victorian resorts, harbours, industry, shipbuilding and fishing communities have all contributed to the glass we find today.
8. Forgetting to Enjoy Yourself
Not every trip is about filling a pocket.
Sometimes it’s about being outside, listening to the waves, drinking a terrible seaside coffee and finding one perfect piece that makes the whole day worthwhile.
Grab a friend – who also end up getting hooked, or your best four-legged friend, or borrow one, they will have the best time!
First Hunt Checklist
Before you head off on your first sea glass adventure, run through this quick checklist.
Before You Leave:
- Check the tide times
- Check the weather forecast
- Look up the Sea Glass Score
- Charge your phone
- Tell someone where you’re going if you’re exploring a remote beach
What To Bring:
- Comfortable footwear
- Small container or pouch for finds
- Waterproof jacket
- Water and snacks
- Camera or phone for photos
- A sense of adventure
When You Arrive:
- Find the wrack line
- Check pebble ridges
- Search around groynes and harbour walls
- Scan slowly
- Look ahead rather than straight down
- Take your time
Most Important Of All:
Don’t worry about finding anything rare.
Your first piece of genuine sea glass is the one you’ll always remember.
Sea Glass Terminology & Colour Rarity
When you spend enough time around sea glass hunters, you’ll start hearing strange words being thrown around. Here’s a quick guide to some of the most common terms.
Wrack Line
The line of seaweed, shells and debris left behind by the previous high tide. Often, one of the first places worth checking.
Ebb Tide
When the tide is moving out.
Many hunters consider the first part of the ebb tide one of the best times to search.
Flood Tide
When the tide is moving back in.
Shingle
A beach made mostly of pebbles rather than sand.
Groyne
A wooden, stone or metal structure built to reduce beach erosion.
Sea glass often accumulates around groynes.
Frosting
The cloudy, matte finish found on genuine sea glass after years of tumbling.
Pitting
Tiny dimples and marks on the surface of older sea glass.
Pirate Glass
Very dark glass that appears black until held up to the light.
Multi
A multi-coloured piece of sea glass, particularly associated with Seaham.
Finding your first multi is a proper sea glass milestone.
Colour Rarity Overview
Common
- White
- Brown
- Green
Most sea glass falls into these colours. Don’t overlook them; some of the best jewellery is made from common colours.
Uncommon
- Aqua
- Light Blue
- Purple
- Milk Glass
These colours are always exciting to find and usually come from older bottles, tableware and decorative glass.
Rare
- Cobalt Blue
- Turquoise
- Yellow
- Black (Pirate Glass)
These colours make experienced hunters slow down for a closer look.
Extremely Rare
- Red
- Orange
- True Pink
Finding one of these can make your entire week.
Legendary
- Multis
- End-of-day glass
- Large marble-grade pieces
These are the finds people talk about for years afterwards.
A quick note on taking glass
In the UK, collecting small amounts of sea glass for personal use is fine. Be sensible, take what you’ll actually use or keep, leave plenty behind, and don’t disturb protected wildlife or habitat. Leave the beach better than you found it if you can.
Remember, this is essentially rubbish from the sea, beautiful rubbish at that, it is allowed, and actually, you are doing a good thing, it isn’t like taking shells etc.
Ready to go?
The best beaches for sea glass in the UK include Seaham (County Durham), Chesil Beach (Dorset), Robin Hood’s Bay (North Yorkshire) and various spots along the Cornish coast, but honestly, any historical coastal town with a pebble beach is worth investigating.
Check the tides. Wear proper shoes. Bring a bag. And prepare to become completely obsessed.
