Fire Glass Vs. Lava Rock: Which One is Best?

This quiz will determine which type of rock would be best to use as a fireplace for its ability to retain heat. Find out the answer and learn about new types of rocks that are only found in certain parts of the world!

The “can you use lava rock and fire glass together” is a question that has been asked before. The answer to the question is no, but it may be worth asking your local hardware store.

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When it comes to building an outdoor fire pit, you may be unsure which material is best.  

Glasses of Fire may generate more heat than lava rock, although lava rock is usually less expensive. Both have Aesthetic merits, and the decision between the two is often a matter of personal taste. 

Between Glasses of Fire and lava rock, there are a few key distinctions. We’ll analyze the following seven aspects in this post to help you determine which of the two is the greatest match for your requirements and desires:


  • Cost
  • Conduction of Heat
  • Aesthetic 
  • Safety
  • Durability
  • Combination of Materials
  • Additional Applications

Contents Table of Contents

  • Comparison of the Costs of Glasses of Fire and Lava Rock
  • Conduction of Heat Comparison of Lava Rock vs. Glasses of Fire
  • Differences in Aesthetics Between Lava Rock and Glasses of Fire
  • Lava Rock vs. Glasses of Fire: Which is Safer?
  • Lava Rock vs. Glasses of Fire: Which Is More Durable?
  • Is it possible to mix lava rock with Glasses of Fire?
  • Additional Applications of Glasses of Fire and Lava Rock

Comparison of the Costs of Glasses of Fire and Lava Rock

There are a few extra costs to consider when deciding between Glasses of Fire and lava rock for your next fire pit:

  • Dimensions of the firepit The more expensive it is to fill a pit, the bigger it is. 
  • Accessibility. One resource may be available locally, while the other must be ordered online. The expense of shipping might soon pile up. 
  • Budget for the project. There are several fees associated with building a fire pit. If this is your first project, you should think about how much of your money you’re prepared to devote to supplies. 
  • Natural gas vs. propane. Another significant expense factor to consider is the kind of gasoline you wish to use. Natural gas is often less expensive, but it needs a fixed pit, while propane is portable but requires refilling, which may be costly depending on use. 

It’s time to pick your filler material once you’ve evaluated these criteria. 

Glasses of Fire is more contemporary than lava rock, which is a more traditional material. As a result, lava rock has a considerably bigger market, making it a less expensive alternative overall.

Regardless of the choice you pick, you’ll need to figure out how much covering you’ll need for your fire pit. This will decide the amount of material you’ll need to buy. 


A free coverage calculator for both lava rock and Glasses of Fire may be found at the following website. 

We’ll look at the following material-specific cost factors:

Lava Rock


If you’re going to utilize lava rock in a fire pit, you’ll probably buy it by the bag rather than by the ton. 

The cost of lava rock varies, ranging from $7 to $25 per bag. It’s also crucial to keep track of how many pounds you obtain each bag. For usage in a fire pit, the usual bag weight is roughly 10 lbs. 

It’s worth noting that lava rock has a higher volume per pound than Glasses of Fire. When comparing lava rock to Glasses of Fire, you’ll normally need half the quantity in pounds to fill your pit. 

The price of your lava rock option is influenced by its color. The most affordable lava rock is usually red, which is also the most common hue for lava rock. 

The second most prevalent hue is black lava rock. While it may be purchased for the same price as red rock, depending on the brand, it can also be more costly. The aesthetic value of black rock is primarily responsible for the price differential.

If you want to buy lava rock in bulk, you may expect to pay per ton or per cubic yard.

Lava rock costs $75 to $110 per cubic yard, according to Home Advisor. 

Glasses of Fire


When purchasing Glasses of Fire, you will most likely be paying per pound. Depending on the brand, you can purchase Glasses of Fire per individual pound, or by larger quantities such as 10 or 20 lbs. 

The reason Glasses of Fire is priced this way partially has to do with color. By purchasing individual pounds, you can mix and match different types and colors of Glasses of Fire.     

Because there are many varieties of Glasses of Fire, prices can vary widely. Most 10 lb. bags average between $25 – $35 per bag. If you are searching for a standard style of Glasses of Fire, this means you should look for a product that you can purchase for around $2 – $3 per pound. 

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If you’re looking for certain color combinations and styles, expect to pay more. The price per pound might range from $10 to more than $10 depending on what you desire. 

Finishing on the glass is where you will see the biggest price jumps. For instance, you can buy classic broken Glasses of Fire with sharper edges for cheaper or spend more to buy Glasses of Fire with finished edges. 

Conduction of Heat Comparison of Lava Rock vs. Glasses of Fire

The kind of material utilized will have an impact on the quantity of heat generated. As a result, the amount of propane or natural gas required will change.

Lava Rock


The thermal conductivity of lava rock is poor. This is owing to its porous nature, which makes it unable to absorb or retain heat.

This might be a concern if your fire pit is used as an outside heat source. You’ll have to use a lot more propane or gas to push the heat outwards as a result. 

If you reside in a location with a warmer general temperature, though, this function may be more useful. Lava rock is a cost-effective and attractive fire pit filler that doesn’t generate too much heat. 

Lava rock also possesses thermodynamic qualities that make it suitable for use as a mulch substitute. As a result, the lava rock may be used for many uses in your backyard, providing you more bang for your money. 

Glasses of Fire


Comparatively, Glasses of Fire is a much better conductor of heat. The glass absorbs the heat, while the reflectiveness helps to disperse the heat back outwards towards those sitting or standing near it.

The main benefit of this is that Glasses of Fire will require much less propane or natural gas. The flame in the fire pit can remain smaller, while still dispersing a good amount of heat.

This makes Glasses of Fire a much better option for fire pits in colder climates that are meant primarily as heat sources. 

Glasses of Fire is also able to distribute the heat of the flame more evenly due to there being more and smaller pieces of it compared to lava rock. 

Note: If you purchase lava rock that has been split up into tiny bits, you may get a similar effect. This, however, may result in extra costs or labor.

Differences in Aesthetics Between Lava Rock and Glasses of Fire

There are many stylistic differences between lava rock and Glasses of Fire, as well as many ways to customize each in their own way. 

The most obvious difference is the immediate appearance of the two. Glasses of Fire is reflective and will sparkle under the fire. Lava rock is more rustic and will remain matte despite the firelight. 

Both materials come in a variety of colors and designs. 

Lava Rock

Although lava rock does not vary much, there are a few different types to pick from.


Color is by far the most varied aspect of lava rocks. There are three basic lava rock hues to pick from:

  • Red
  • Brown
  • Black

Lava rock, on the other hand, may be gray in hue. The classic red lava rock may be found below.


It’s vital to keep in mind that lava rock with unusual hues, such as blue or green, may have been dyed. Check to see whether the lava rock you’re buying is suitable for use with fire. 


Lava rocks are also available in a variety of styles. They’ll have jagged edges by nature, but they may be shaped into oval forms with smoother surfaces, which is known as tumbling lava rock. Because more labour goes into the manufacture of these lava rocks, they are usually more costly.  

Glasses of Fire

Glasses of Fire is highly customizable since glass can come in all shapes, colors, and styles. 


Color-wise, you can find pretty much any color of Glasses of Fire you want. There are a few colors that are more commonly used, and therefore less expensive than more rare colors. They include:

  • Blues in various shades (teal, turquoise, sky, cobalt, etc.)
  • Obsidian Black
  • Gold
  • White
  • Translucent

Blue is one of the most common colors used because it is the complementary color to the orange tones of the fire. This gives it a visually appealing contrast. The Glasses of Fire shown below has several different colors to show from and is highly rated on amazon.


Shape and Style

There are two main types of styles for Glasses of Fire:

  • Crystals that have been broken. These are the components that don’t have a consistent form. “Fractured” is a term used to describe them. They have jagged edges and a jagged form.
  • Beads that are smooth. These are the components that have a consistent shape, generally oval or round. They have a perfectly smooth surface and edges. Drops, rocks, and beads are all terms that have been used to describe them. 

Of course, there are variations on these two types. Smoothened edges may be added to the crystal form, and the smooth form can be sculpted into cubes or other geometric shapes. 


Glasses of Fire can have two finishes:

  • Reflective Glasses of Fire will have a mirrored finish on either one or multiple sides that causes the light’s reflection to be much brighter.
  • Non-reflective Glasses of Fire will still reflect the light from the fire but in a more uniform and dispersed way.

The pricing of different Glasses of Firees is largely dependent on individual companies.  

Lava Rock vs. Glasses of Fire: Which is Safer?

While lava rocks and Glasses of Fire are both relatively safe options for fire pits, there are a few serious issues to keep in mind

Lava Rock

The porousness of lava rocks is the most serious safety risk. Lava rocks may absorb a significant amount of moisture from the air and environment in which they are found. Once on fire, this moisture may cause the pebbles to rupture or explode. 

To avoid this, make sure your lava rocks are maintained in a dry location and protected from weather and ambient moisture while not in use. 

If there is any lingering wetness, running the fire pit on low heat might assist to dry them off. However, if they start to pop, switch off the fire pit right away. 

Some people also believe that any rock may be used in a fire pit. While lava rocks are acceptable to use in a fire pit, there are certain other rocks that should not be used at high heat:

  • River Sandstone
  • Sandstone
  • Gravel
  • Natural rocks that aren’t quite what you’re looking for

Glasses of Fire

Like lava rocks, if Glasses of Fire is wet, it can cause popping or explosion. Glasses of Fire does not absorb moisture internally the way lava rocks do, however, and is much easier to dry and keep dry.

Glasses of Fire is made from tempered glass that can withstand extreme temperatures without melting or emitting toxic chemicals or gases. 

When choosing a Glasses of Fire, it is crucial to ensure that it is properly tempered. Non-tempered glass is highly dangerous under high heat. 

It is important to check reviews of any Glasses of Fire product you choose. If reviews report popping, melting, or cracking of any kind, you should consider a different product. 

The style of Glasses of Fire you choose is another safety consideration. Crystal forms with jagged edges can look very beautiful and be highly reflective, but the sharp edges do pose a safety threat. 

If you choose a Glasses of Fire with sharp edges, the fire pit should be kept out of reach of children or pets when not in use.

Lava Rock vs. Glasses of Fire: Which Is More Durable?

Both materials are very long-lasting, making them excellent long-term backyard design investments. Nonetheless, there are a few things to bear in mind.

Lava Rock

Lava rock is a naturally long-lasting and non-decomposable substance. As a result, it is very useful as a fire pit material.

Moisture is the most serious danger to lava rock’s resilience. Lava rocks, as previously stated, may absorb a lot of liquid. This may lead to them cracking, popping, or even exploding. 

Heat rock should be used to dry lava with considerable care and low heat. The firm from whom you purchased your lava rock should offer instructions on how to dry it correctly.

If your lava rock has been exposed to the weather for an extended length of time, it may be preferable to simply replace the soaked lava rock with a new set.

If lava rock is widely utilized, it is also advised that it be updated every few seasons. 

Glasses of Fire

Like lava rock, Glasses of Fire is very durable and does not decompose. There are a few care techniques that Glasses of Fire requires that lava rocks do not, however. 

The biggest issue you may run into with Glasses of Fire is the material can get fairly dirty. This is caused by residue build-up from the propane or gas, resulting in a discolored film on top of the glass.

Glasses of Fire should be cleaned promptly once you notice residue build-up. The longer it is left unaddressed, the harder it will become to clean. 

Luckily, cleaning Glasses of Fire is not an extensive process. All you need is dish soap and water. It is important to rinse the soap off thoroughly to prevent damage to the fire pit. 

After cleaning, the Glasses of Fire must be completely dry before going back into the pit. Wet Glasses of Fire can pop and explode just like lava rocks. 

Propane is going to dirty your Glasses of Fire quicker than natural gas, so pay special attention to this if you choose to use propane. 

Is it possible to mix lava rock with Glasses of Fire?

After learning about lava rocks and Glasses of Fire, you may find yourself still unable to decide between the two. 

The best thing about these two materials is that they may be safely used together. This offers up new design possibilities for your fire pit. 

Combining the two may also provide a number of advantages. Lava rock is often used not only for aesthetics but also to preserve fire pit components. 

This is because lava rock works better as an insulator than Glasses of Fire. Therefore, using lava rock as the bottom layer better protects the fire pit from the high temperature.

If you are a fan of the Glasses of Fire Aesthetic but do not have the budget for an entire pit’s worth of it, using lava rock as a base is also a great way to cut down costs. 

Additional Applications of Glasses of Fire and Lava Rock

So, you have chosen a material, or combined the two, and are ready to move on to a new backyard project. Lava rock and Glasses of Fire could be your inspiration!

Repeating materials in other areas can help bring an overall cohesiveness and design to your outdoor space. Here are a few additional ways to utilize lava rock and Glasses of Fire:

Lava Rock

  • Grills. In grills, lava rocks may be an effective substitute for charcoal. This may also help you save money on gas while grilling. 
  • Mulch is being replaced. The use of lava rock as a garden bed may be both aesthetically and functionally useful. While it isn’t ideal for all plants, it may aid in temperature and moisture regulation.
  • Gardens made of rocks. Lava rocks are an excellent choice for creating complex and intriguing rock garden patterns.

Glasses of Fire 

  • Planters. Glasses of Fire is a great addition to bring to your planters. It is especially good at weed prevention, as well as helping to keep the soil from drying out. 
  • Tabletops. Outdoor furniture can be spruced up by adding some Glasses of Fire beneath glass or plastic panels to create fun and colorful statement pieces.
  • Walkways or steppingstones. Glasses of Fire can create beautiful details in your walkways, as well as be made into steppingstones. 

Lava rocks and Glasses of Fire are both great mediums to use for you fire pits, and to add details around your yard, so have fun and get creative!


The “what to put under fire glass” is a question that has been asked many times. The answer is simple- you need to find something that can withstand the heat of the fire glass, like lava rocks.

Frequently Asked Questions

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