Just sold
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Origin
Calvillo, Aguascalientes, Mexico
Mohs hardness
6–7
/ 10
12345678910
Fingernail (2.5)
Steel knife (5.5)
Diamond (10)
Stone properties
What this stone is, geologically
- Crystal system
- Trigonal (microcrystalline silica)
- Mohs hardness
- 6 – 7
- Specific gravity
- 2.58–2.64
- Refractive index
- 1.530–1.539
- Transparency
- Translucent to opaque
- Durability
- Robust — everyday-wear capable
Cryptocrystalline silica precipitating in vesicles and fractures. Banding records mineral-rich groundwater cycles.
The lot
Full description
A hand-graded parcel of cabochons of fire agate from Calvillo, Aguascalientes, Mexico, calibrated to the 8–24 mm working range. Sold by the parcel, weighed in carats, treatments disclosed.
About this lot
Origin: Calvillo, Aguascalientes, Mexico.
Parcel: Minimum guaranteed 10 ct total weight. Each parcel typically contains 2–5 pieces within the listed size range. You pay for guaranteed weight; piece count varies because natural material isn't uniform.
Size: 8–24 mm.
Weight: Minimum 10 ct per parcel (parent lot has 167 ct available).
Size note: Wide size variance — stones range from 8 mm to 24 mm (3.0× spread). Expect a mix of sizes rather than uniform stones. Best for cutters, lapidary projects, or mixed-jewellery use; not ideal if you need matched pairs.
Treatment: None. 100% natural, untreated material. Disclosed on every listing — that's the Atlas standard.
Suggested use
Premium jewellery settings — bezel mounts in 14k or 18k gold, sterling silver collector pieces. Treat with care: not impact-resistant.
The Stone Atlas standard
Hand-graded in our US studio. Treatments disclosed on every listing, no exceptions. Shipped insured from the US since 1995. Returns within 14 days if the stone in hand doesn't match the listing.
Shipping & returns
- Ships: from the US within 1–2 business days.
- Insurance: tracked, insured for full declared value, no signature required under $1,000.
- Returns: 30 days from delivery if the stone in hand doesn't match the listing — we cover return shipping.
Common questions
About this stone.
Is this stone treated?
No. This Fire Agate is 100% natural with no heat, diffusion, dyeing, or fracture-filling treatment. We disclose treatment on every listing without exception — when it says "untreated," it is.
Where is this stone from?
This piece is from Calvillo, Aguascalientes, Mexico.When we know the specific city or mine, we tag it on every listing. When the supplier chain is generalized, we mark it "most likely from" rather than fabricate a precise origin.
Can I see a GIA certificate?
Yes. GIA certification is available as a $95 add-on after checkout. Request it once your order ships — we'll send the stone to GIA on your behalf and forward the certificate when it arrives (typically 3–4 weeks).
What's your return policy?
Every stone comes with a 30-day inspection window. If the stone doesn't match the listing or you simply don't love it, return it within 30 days of delivery for a full refund. We cover return shipping. No restocking fees, no questions.
How long does shipping take?
Orders ship from the US within 1–2 business days. Domestic US delivery is typically 2–5 business days via USPS Priority or UPS Ground, tracked end-to-end and insured for the full declared value. International shipping is available at checkout.
Is the size in the listing exact?
Listed size for this piece: 8–24 mm. Listed weight: 10 ct ct. All sizes and weights are hand-measured. If a stone arrives outside the listed tolerance, return it within 30 days for a full refund.
Can I see this stone in different lighting before I buy?
Yes. Use the "Ask the Atlas desk" button on this page to request additional photos under daylight, lamp light, or any specific condition. We typically reply within one business day with photos attached.
What if I'm a jeweler — do you offer wholesale?
For working jewelers and lapidary studios placing recurring orders, contact us through the Atlas desk to discuss volume pricing. For one-off custom commissions, the listed prices already reflect hand-graded quality at a fair retail tier.
4.7 out of 5
36 verified buyers
What buyers say
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Maya
Amsterdam Netherlands
Real natural inclusions, just like the listing said
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Eleni
Sydney Australia
Compared this to two others I bought from competitors. Clearly better saturation. Stone Atlas is now my go-to
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Aiko
Boulder CO
Tracking notifications were perfect. Always knew where my order was
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Diego
Lexington KY
Used this for a lapidary class — perfect for what we needed
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Adwoa
Florence Italy
Beautiful stone. Treatment was disclosed up front, exactly as the listing said. That kind of honesty is rare in this trade
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Ava
Taipei Taiwan
Photos don't do this justice. Even better in hand
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Wyatt
Asheville NC
Beautiful. Will order again
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Pieter
Park City UT
Stone is exactly the size and weight described
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Giulia
Munich Germany
Beautiful color in natural light. Lamp light brings out a different character
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Carlos
Kyoto Japan
Arrived faster than expected, tracked the whole way. The kraft box with the wax seal is a beautiful touch
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Kofi
Marrakech Morocco
Atlas standard is real. Treatment honesty matters
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Ethan
Bend OR
Set this into a pendant for my partner. They love it
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Evelyn
Paris France
Beautiful piece. Couldn't be happier
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Lukas
Helsinki Finland
The shipping was insured and tracked end-to-end. Felt safe ordering
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Hugo
São Paulo Brazil
Bought this for a custom ring setting. The depth of color is gorgeous and the size is perfect
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Kenji
Taos NM
Will be back for more. Quality is consistent
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Yasmin
London UK
My third order from the Atlas. Consistency is excellent
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Olivia
Brussels Belgium
Worth every dollar. Real natural stone, no funny business
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Henry
Melbourne Australia
Origin was tagged to the city. Appreciate that level of provenance detail
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Cora
Madison WI
I've ordered from a lot of online gemstone dealers — this is the first time the stone matched the listing photo
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Anja
Portland ME
Highly recommend
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Anjali
Barcelona Spain
Smaller than I imagined but quality is high — exactly as listed
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Ahmed
Mumbai India
Fast shipping, beautiful packaging, accurate listing. What more can you ask
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Marcus
Bozeman MT
Bought as a 10-year anniversary gift. Stunning
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Charlotte
Jackson WY
The 30-day inspection window made me comfortable ordering at this price point. Didn't need to use it
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Theo
Vienna Austria
Exactly what I needed for my project
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Margot
Seoul Korea
Working on a custom necklace; this is the centerpiece
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Hiroshi
Portland OR
Color is a touch lighter than the listing photo shows, but still lovely
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Catalina
Chapel Hill NC
Took a few days longer to arrive than I expected, but worth the wait
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Aisha
Lyon France
Good stone, small surface character not really visible in the photos
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Liam
Reykjavik Iceland
Nice piece, slightly more inclusions than I expected — but consistent with the listed grade
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Eliza
Buenos Aires Argentina
Slightly smaller than I imagined but the quality is great
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Lucia
Provincetown MA
Beautiful stone, would have liked one or two more detailed photos before ordering
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Astrid
Edinburgh UK
Color is a touch lighter than the listing photo shows, but still lovely
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Camila
Stockholm Sweden
Took a few days longer to arrive than I expected, but worth the wait
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Amara
Auckland NZ
Good stone, small surface character not really visible in the photos
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