Marble Mosaic Tiles Tumbled 3/8-Inch

1-pound loose marble mosaic tiles (approx. 180 to 200 pieces)

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Marble Mosaic Tiles Tumbled 3/8-Inch are mini stone cubes sold loose by the pound (approximately 180 to 200 pieces) for use in mosaic art projects, murals, and as an architectural covering. The 3/8-inch size is nominal, and significant variation occurs between types of stone. Some stone is softer than other types of stone, and it will tumble to a smaller size with more rounded corners. The harder the stone, the sharper the corners and the larger the size (and therefore the fewer pieces per pound). We even see this variation between different batches of the same type of stone. It is a natural material sourced at different quarries, and so this is to be expected. We also see variation in pattern and color between different batches of stone.

The small size makes it possible to make detailed mosaic designs with little or no cutting. This is important because cutting can mar the finish of tumbled mosaic marble, and stone usually does not break as cleanly or as predictably as ceramic or glass mosaic tile. All that being said, it is possible to cut pieces with the Compound Tile Nipper and shape them with a Marble File.

Marble Mosaic Tiles Tumbled 3/8-Inch

  • tumble-finished natural undyed stone.
  • material varies by batch for color, pattern, size, and sharpness of corners.
  • Each tile is NOMINALLY 3/8 inch x 3/8 inch, with variation by batch
  • Coverage: approximately 875 to 900 tiles will cover 1 square feet when using a standard grout gap of 1/32 inch. (Remember the tile size varies.)
  • Thickness: 3/8 inch NOMINAL.
  • Recommended for dry locations where water cannot pool.
  • vulnerable to freeze damage like all porous materials.
  • should be sealed with a tile and grout sealer to minimize staining and freeze damage.

Material Clarification

Many varieties of marble mosaic tile are not technically marble. Other varieties of stone are used to provide colors not available in marble, but all our marble mosaic is undyed natural stone with an unsealed tumble finish.

Expect Product Variation

This product will vary by batch for several reasons, but mainly because it is a natural material that varies from quarry to quarry and even within the same quarry. Expect variation in product color, pattern, size, and roundness at the corners.

The size of the stones and the roundness/sharpness of the corners will vary based on the hardness of the stone. Softer stone tumbles faster than harder stone.

Never Install Tile in Batches

It takes a tremendous amount of energy to cut stone tile. To offer the tile to us at an affordable price, our factory has to be practical and use looser standards of quality control. If consistency is extremely important to you, then make sure you use something other than natural stone. However, you should be aware that all forms of mosaic tile can and do vary by manufacturer batch, and so you should never order your materials in stages or begin installing tile before you have all that you will need. Even the most expensive brands of Italian glass tile comes with warnings to inspect and mix different boxes of their tile before you install it. This caveat certainly applies to natural stone produced in China!

Product Coverage

There are approximately 180 to 200 marble mosaic tiles per pound, which covers about 30 to 33 square inches with a grout spacing of 1/32 inch. To cover a square foot, you need approximately 875 to 900 stones depending on the color. (Some stone types are softer and tumble smaller than 3/8 inch.) Use our tile estimator to calculate how much you need for your project.


Tile thickness is approximately 3/8 inch, which is thicker than our regular glass mosaic tile. If you are pressing tiles into thinset mortar or concrete, then it would be possible to use these with thinner glass tile, but it would be problematic if you are gluing tiles to a flat surface.

Cutting Tile

Our Compound Tile Nipper is the recommended cutting tool for stone and other hard materials such as porcelain. A Marble File is extremely useful for shaping hard materials. It is much easier to file off a tiny amount than it is to try to cut off a tiny amount.


Grout will stain unpolished and unsealed stone because it is porous. The stone has to be sealed with a tile and grout sealer BEFORE you grout it. However, you shouldn’t seal any surface where grout or glue needs to stick to the stone. Here is what we recommend for presealing porous materials before grouting:

  • Glue or cement your mosaic tiles into place.
  • Use a rag dampened with sealer or a small artists paint brush to seal only the top faces of the tiles.
  • Take care not to drip sealer down between the tiles or down the sides of the tiles.

We use TileLab brand Grout and Tile Sealer for a normal seal. We use TileLab brand Stone Enhancer and Sealer if we want to slightly enhance/darken the stone colors (recommended). Both of these products are available at Home Depot. More expensive premium products are available.

Using Marble Tile for Outdoor Mosaic Art

Most people think that stone is more durable than glass for outdoor mosaic art, but actually the reverse is true for several reasons:


Not all stone is hard, and natural stone only comes in so many colors. To get the range of colors needed to make a mosaic, softer varieties of stone such as honey onyx (actually a calcite) are sometimes all that is available for a particular color. This is especially true when you are discussing affordable types of stone. Sure, emeralds are a rich green, but they are also relatively rare, small and expensive.

Porosity and Freeze Damage

Glass is non-porous, and thus water cannot penetrate into it and then freeze and expand, which causes porous stone to crack and flack away. Keep in mind that the reason we have so many ancient Greek and Roman mosaics left after all the millenia is that the Mediterranean climate is relatively warm and dry. It also helped that many of the ones we now have were buried under volcanic ash for centuries.

Chemically Vulnerable

Remember that not all marble mosaic tile is technically marble, and even if it were, marble isn’t that hard, and it is also susceptible to chemical damage by naturally occurring substances. For example, the products of decaying organic matter such as rotting leaves are acidic. Marble dissolves in acid. (You can actually listen to mable fizz when you pour vinegar on it.) This is how the acid rain from automobile exhaust in European cities has melted ancient statues. Other varieties of stone are also vulnerable to organic acids and other natural substances.

How To Make Marble Mosaics Last

Marble (and the other stone types described as marble) are best used for indoor mosaics where water cannot pool on the surface. However, marble can be used outdoors provided you seal it very well with a tile and grout sealer and check the seal every few years to make sure that water is still beading on the surface instead of soaking in and wetting it. This really isn’t extra work. Even if you used non-porous glass tile, you would still need to seal the mosaic and periodically check the seal because the grout between the tiles is porous and vulnerable to freeze damage.

Outdoor mosaics made from marble should be on vertical surfaces such as walls instead of horizontal surfaces such as the seats of benches or walkways.

How To Make Mosaic Art

For more advice on designing your mosaic project or mounting, cutting, and grouting tile, please see our page of Mosaic Frequently Asked Questions or our Mosaic Information Guide, which lists instructional pages described by topic. We also post new articles about making mosaics at our How to Mosaic Blog.

ImageNameUnit SizePriceBuy
Copper Yellow TMSS-CY tumbled marble mosaic tile 3/8-inch
Copper Yellow TMSS-CY1 lb ~180 pieces (10mm)$6.85 $5.48
Dark Woodvein TMSS-DW tumbled marble mosaic tile 3/8-inch
Dark Woodvein TMSS-DW1 lb ~180 pieces (10mm)$6.85 $5.48
Gray Woodvein TMSS-GW tumbled marble mosaic tile 3/8-inch
Gray Woodvein TMSS-GW1 lb ~180 pieces (10mm)$7.26 $5.80
Lingbi Pale Pewter TMSS-LI tumbled marble mosaic tile 3/8-inch
Lingbi Pale Pewter TMSS-LI1 lb ~180 pieces (10mm)$7.26 $5.80
Lotus Green TMSS-LG tumbled marble mosaic tile 3/8-inch
Lotus Green TMSS-LG1 lb ~180 pieces (10mm)$6.85 $5.48
Lushan Green TMSS-LU tumbled marble mosaic tile 3/8-inch
Lushan Green TMSS-LU1 lb ~180 pieces (10mm)$7.26 $5.80
Ming Green TMSS-MG tumbled marble mosaic tile 3/8-inch
Ming Green TMSS-MG1 lb ~180 pieces (10mm)$6.23 $4.98
Nero Marquina TMSS-NM tumbled marble mosaic tile 3/8-inch
Nero Marquina TMSS-NM1 lb ~180 pieces (10mm)$6.23 $4.98
Red Brown TMSS-RB tumbled marble mosaic tile 3/8-inch
Red Brown TMSS-RB1 lb ~180 pieces (10mm)$6.63 $5.30
Rojo Alicante TMSS-RA tumbled marble mosaic tile 3/8-inch
Rojo Alicante TMSS-RA1 lb ~180 pieces (10mm)$6.23 $4.98
Rosin Yellow TMSS-RY tumbled marble mosaic tile 3/8-inch
Rosin Yellow TMSS-RY1 lb ~180 pieces (10mm)$7.26 $5.80
Vegetable Green TMSS-VG tumbled marble mosaic tile 3/8-inch
Vegetable Green TMSS-VG1 lb ~180 pieces (10mm)$7.26 $5.80
Marble Mosaic Tile Tumbled 3/8-Inch
Marble Mosaic Tiles Tumbled 3/8-Inch