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Tumbled Sea Glass

What is tumbled sea glass? 

That's a good question. On this page you'll find answers to the following questions:

What is tumbled glass?

At its most basic level, it's glass that has been tumbled…and tumbled…and tumbled some more with other hard objects for a period of time, causing tiny nicks in the surface.

As it's tumbled further, it loses its shiny surface and the sharp edges of the glass become softened.
With a lot of tumbling, the glass will eventually lose all edges and corners and become rounded or oval.

What causes the tumbling?

Basically, there are two types of tumbled glass.

The first type is glass that's been put in a machine called a tumbler and mechanically tumbled for periods of time, usually with several other kinds of material. 

  • These might be ball bearings or metal of various sizes or rocks. 
  • A chemical or burnishing compound might be added. 
Most commonly, these mechanical tumblers are used to produce those beautifully shiny rocks that you find in crafts stores or rock hobby shops.

But if you put glass in one of these mechanical tumblers, you can get a frosty or patinaed surface, that "soft" look.

The second type of tumbled glass

Another type of tumbled glass is glass that's been tumbled for long periods of time naturally.

  • This usually happens when the glass is exposed to moving water, causing it to be tumbled with rocks, sand, et cetera.
  • It can occur in streams and rivers to a certain extent, but by far the most common tumbling action that produces fine tumbled sea glass is from waves against a shore.
  • The constant motion of the waves on a beach between the low and high tide mark produces what's called sea glass (found on ocean shores, naturally) or beach glass (which would include naturally wave-tumbled glass that you'd find on the shores of a large lake, like the Great Lakes lying between the United States and Canada).  

So, the two basic types of tumbled glass would be:

  • Man made (tumbled in a mechanical tumbler) and 
  • Naturally made (wave action). 

By usage, "tumbled glass" has come to mean artificially-produced "sea" glass, while the terms "sea glass" or "beach glass" mean the real thing.

With gorgeous color photographs and step-by-step instructions, this book teaches the essential skills, like drilling glass, wire wrapping, and texturing metal, to turn your beach-found bounty into attractive accessories, including:

What are the differences between man-made tumbled sea glass and naturally-tumbled sea glass?

There are very noticeable differences between artificially and naturally tumbled sea glass. Here are some features of artificially-tumbled glass:

  • Glass tumbled in a tumbler usually still has corners and edges visible, although softened.
  • The patina of the tumbled surface is generally pretty smooth, or less "frosted" looking in mechanically-produced tumbled glass. 

Sea or beach glass that's of good quality, on the other hand, has very rounded edges, no corners, and a much frostier look.

The facets of the frosted surface of wave-tumbled sea glass reflect light in a distinctive way, causing more of a "glow" than is found in mechanically-tumbled glass.

Once you have collected genuine tumbled sea glass yourself for a short time, you will be quick to see the differences between the two.  

Is there a real need for truthful advertising of man-made sea glass?

What would you think if you were to buy a sterling silver necklace or a gold watch and then found out - it wasn't made of silver or gold but was made with some much cheaper and common metal?  
As with many other valuable products, false advertising has been around since the early days of man's history. That doesn't make it right! 

There is a need for making a distinction between real surf-tumbled sea glass or beach glass and man-made tumbled glass. 

The unfortunate truth is that sellers are misleading buyers by selling them what is called sea glass but is really imitation or fake sea glass - much lower quality and value.

A good grade of real, genuine, pure sea or beach glass, like gold or silver, is much more beautiful and costly than its imitators.  

sea glass colors line

Don't be fooled by the false advertiser selling "sea glass" or "beach glass." 

Check the pages of this site to see and understand what real sea glass is like. 

See "What Is Sea Glass," "Sea Glass Color," and "Grading Sea Glass" for helpful information.

sea glass colors line

Does this mean that faux or imitation sea glass is good for nothing and a scam? 

Not at all.  

  • Tumbled sea glass or faux sea glass can be useful in a variety of imitation sea glass or beach glass crafts.
  • Real sea glass does take a lot of time to collect (more valuable) and some projects require a lot of glass or a large number of unusual matching colors - a need that can only be filled by faux (artificial) sea glass.
  • Another thing is that there are quite a few folks that just don't have ready access to genuine sea glass or they can't afford to pay for a lot of pure sea glass. Tumbled or faux sea glass fills these needs perfectly well. 

Why do some folks give tumbled or faux (artificial) sea glass a bad rap?

Where tumbled sea glass gets a bad name is from unscrupulous people passing off tumbled sea glass as genuine sea glass as the real thing.

They lead you to believe their product is made with 100% real sea glass when in fact it's just an imitation.

This is especially important when it comes to rare and unusual colors and/or sea glass jewelry.

  •     Real sea glass jewelry made with a high grade of sea glass and rare colors can cost quite a bit of money.
  •     Selling jewelry using fake sea glass that costs a nickel a piece is just plain taking advantage of people.

To sum it all up, advertisers need to clearly label their imitation sea glass as imitation, man-made, faux, or other terms that clearly tell you, the consumer, what you are getting! 

Sea Glass
Fake Sea Glass Marbles?
Sea Glass bulk buy sea glass
Guide to Buying Sea Glass
Sea Glass
Natural or Man-Tumbled?
Sea Glass
Genuine Sea Glass


Have your say about what you just read! Leave me a comment in the box below.


Have your say about what you just read! Leave me a comment in the box below.

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OdysseySeaGlass relies on advertising to cover costs of sharing sea glass info from around the world. Purchasing from an ad on our site costs no more than directly and provides us with a few cents income.

You will see Google and Amazon ads as well a few other advertisers as you view our pages. 

NOTE that some of these advertisements offer sea glass that is FAKE sea glass. 

We don't have control over these ads so be aware before you buy.

Browse Our List of Recommended Sea Glass and Beach Books


Beach Glass - naturally wave-tumbled and frosted glass found on fresh-water or salt-water beaches.

Sea Glass - beach glass found specifically on salt-water beaches

On What is Sea Glass