Analysis by Valery Grin · · updated October 3, 2026
Lithos Materie Etna lava stone 30 × 30 cm for pizza
Square volcanic stone slab, set on the grate above a deflector, for kamados with a 46 cm grate or larger
From€40
Reference price on Amazon (June 2026) · subject to change
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- Material
- Lava stone (from Etna per the listing), 30 × 30 cm, 3 cm thick per the table
Quick answer
Yes, if you want a pizza stone that is not cordierite and your kamado has a 46 cm grate or larger. It is a 30 × 30 cm Etna lava slab rated 4.6 from 371 reviews on Amazon. The listing gives no weight or maximum temperature, contradicts itself on thickness, and delivery is not free.
Etna lava stone, 30 × 30 cm and 3 cm thick per the listing table. Its diagonal of about 42 cm fits the 46 cm grate of a Large or a Classic.
The Lithos Materie 30 × 30 is a lava stone slab, 30 cm a side and 3 cm thick according to the listing table, in grey-black. The text presents it as a handmade product, made "in our laboratory" from ancient Etna lava flows and with "absolute absence of lead". The brand is Lithos Materie and the manufacturer is S.M Romeo Lavorazioni Marmi S.R.L.; the "Ollare" in the translated Amazon title is not the brand. The bullets promise that it keeps its heat, suits long cooks, needs no fat and cleans easily.
On a kamado it goes on the grate and above a deflector, not instead of one: it is not a plate setter and does not shield the pizza from the coals by itself. The pizza cooks by indirect heat with the dome closed, and the stone supplies the hot base. The deflector depends on the kamado: on a Large, one such as the Onlyfire 44.5 cm, made for that size; on a Classic, the half-moon deflectors of its own system; on any other model, measure first.
Size decides the fit. A 30 cm square has a diagonal of about 42 cm (simple arithmetic, not a listing figure), so it sits inside the 46 cm grate of a Large or a Classic with about 2 cm to spare at each corner (an estimate), and there is plenty of room on an XL or a 61 cm Big Joe. On a MiniMax or a Joe Jr, with a grate of about 33 cm, the corners overhang: it is not for them. The usable pizza is around 28 cm (an estimate) and you bake one at a time. The catalogue's 40 cm AMZBBQ perforated peel is wider than this 30 cm stone and is meant for a 61 cm kamado: do not buy the two together by mistake. Check the clearance under the dome, because 3 cm of stone adds to the height of the pizza.
On the material, the listing says little. It states that the stone retains heat, but does not compare it with the cordierite or the steel in the catalogue, and it publishes no preheat time, maximum temperature, weight or thermal-shock resistance. As a matter of physics, 3 cm of stone takes a while to load with heat, so expect a long preheat; that is an inference, not a published figure. On curing, the listing refers to instructions "included in the package", and those take precedence. As a general precaution, not published by the seller, it is wise to heat it from cold along with the kamado and not to wet it while hot. The Neapolitan pizza recipe is a starting point for timings.
The drawbacks: the thickness is inconsistent, 3 cm in the table and "minimum 2 cm" in the text. The listing groups several sizes, with a made-to-measure slab in 24 hours according to the seller; this ASIN is the 30 × 30, so check the size selected before paying. It is likely that the 4.6 and the 371 reviews mix sizes. Delivery is not free and looks expensive next to the price of the piece. No warranty is published either.
Verdict: a well-rated volcanic stone that is worth it if you want to try a different material in a kamado with a 46 cm grate or larger and can live with a listing thin on technical data.
A well-rated alternative to cordierite, with a listing thin on technical data and expensive delivery. Worth it for the material, not as the cheap option.
Editorial rating from spec sheet, measurements and kamado fit · not a hands-on test
Pros
- Etna lava stone, an alternative to the cordierite and steel in the catalogue
- At 30 × 30 cm, the diagonal of about 42 cm fits a 46 cm grate
- Average rating of 4.6 out of 5 from 371 Amazon reviews
- Brand and maker are named in the listing, which states no lead
Cons
- Inconsistent thickness: 3 cm in the table, "minimum 2 cm" in the listing text
- Delivery is not free and is expensive next to the price of the piece
- No weight, maximum temperature or curing given; instructions are in the package
Who it's for
For owners of a Large, a Classic or bigger who bake one pizza at a time and want to try volcanic stone instead of cordierite or steel.
Not for
If your kamado is a MiniMax or a Joe Jr, a diagonal of about 42 cm will not fit a 33 cm grate. And if you want the cheapest stone, delivery weighs on the total.
Specifications
- Material
- Lava stone (from Etna per the listing), 30 × 30 cm, 3 cm thick per the table
- Includes
- Instructions for use (inside the package)
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Goes well with
Onlyfire F-FPA5049-YE-EU: 44.5 cm round cordierite heat deflector
The stone does not work alone: it sits on the grate and this 44.5 cm cordierite deflector goes beneath it, so the pizza gets indirect heat. It is made for the grate of a Large; in another kamado, check the diameter first.
€37
HOT! Kitchenware multilayer birch pizza peel, 29 × 41.5 cm
A stone 30 cm a side needs a peel that does not overhang it. This birch one measures 29 × 41.5 cm per its listing, so it comes close to the size of the stone and lets you load the dough without going over the edge.
€19
WMF BBQ Heat-Resistant Leather Gloves 40 cm (Pair)
The stone, the deflector and the grate all hold heat during the cook, and the stone listing asks for careful handling. Leather gloves of 40 cm protect hand and forearm when taking the pizza out or moving the hot grate.
€39
FAQ
Will it fit my kamado?
A 30 cm square has a diagonal of about 42 cm, so it fits the 46 cm grate of a Large or a Classic, with room to spare on an XL or a Big Joe. On a MiniMax or a Joe Jr, with a grate of about 33 cm, the corners overhang. The diagonal is arithmetic, not a listing figure. Also check the clearance under the dome, because the stone is 3 cm thick per the table and the pizza adds to that.
Does it go direct on the coals or on a deflector?
On the grate and above a deflector. The stone does not replace the plate setter: without one, the base of the pizza would take almost direct heat from the coals and burn before the rest was done. The deflector makes the cook indirect and the stone supplies the hot base. On a Large, the 44.5 cm Onlyfire deflector in the catalogue fits; on a Classic, the half-moon deflectors of its own system; on other kamados, measure before buying.
Does it need curing before use?
The listing does not say. It only states that instructions for use come in the package, so whatever that sheet says is what to follow. As a generic precaution, not published by the seller, it is wise to heat it gradually along with the kamado and keep cold water off it when hot, since the listing does not give its thermal-shock resistance either.
How does it differ from the cordierite or steel in the catalogue?
In the material, and little else that can be asserted. This is Etna lava stone; the catalogue has cordierite stones, such as the Blumtal or the Navaris, and steel plates, such as the Chef Pomodoro. The listing says it keeps heat for a long time but compares it with nothing, so it would not be honest to promise it heats faster or retains more. It is an alternative material, not a proven improvement.