Rutilated Quartz from Brazil, hand-graded by The Stone Atlas, lot XA25
Origin Novo Horizonte, Bahia, Brazil
Mohs hardness 7 / 10
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Fingernail (2.5) Steel knife (5.5) Diamond (10)

Stone properties

What this stone is, geologically

Crystal system
Trigonal (quartz group)
Mohs hardness
7
Specific gravity
2.65
Refractive index
1.544–1.553
Transparency
Transparent to translucent
Durability
Excellent — daily-wear safe

Macrocrystalline silica forming in pegmatites and hydrothermal cavities. Coloration arises from trace iron, aluminum, or oriented inclusions.

The lot

Full description

A hand-graded cabochon of rutilated quartz from Novo Horizonte, Bahia, Brazil, calibrated to the 12–34 mm working range. Sold as a single piece, weighed in carats, treatments disclosed.

About this lot

Origin: Novo Horizonte, Bahia, Brazil.

Format: One specific cabochon, weighing approximately 16 ct, hand-graded from a parent lot of 483 ct. Each stone is similar in size and grade; you receive one cab matched to the listing.

Size: 12–34 mm.

Weight: ~16 ct per piece.

Size note: Stones in the parent lot range widely from 12 mm to 34 mm (2.8× spread). The specific piece you receive may be on either end of that range — request a photo before ordering if size is critical.

Treatment: None. 100% natural, untreated material. Disclosed on every listing — that's the Atlas standard.

Suggested use

Cabochon settings, lapidary work, or studio display. Durable (Mohs 7).

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 Rutilated Quartz 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 Novo Horizonte, Bahia, Brazil.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: 12–34 mm. Listed weight: 16 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.

4.8 out of 5

15 verified buyers

What buyers say

  1. Ethan

    Singapore

    Verified buyer 7d ago

    I've ordered from a lot of online gemstone dealers — this is the first time the stone matched the listing photo

  2. Evelyn

    Austin TX

    Verified buyer 12d ago

    Highly recommend

  3. Lukas

    Ann Arbor MI

    Verified buyer 17d ago

    Smaller than I imagined but quality is high — exactly as listed

  4. Hugo

    Bordeaux France

    Verified buyer 22d ago

    Fast shipping, beautiful packaging, accurate listing. What more can you ask

  5. Kenji

    Prague Czechia

    Verified buyer 27d ago

    Bought as a 10-year anniversary gift. Stunning

  6. Yasmin

    Mexico City Mexico

    Verified buyer 32d ago

    The 30-day inspection window made me comfortable ordering at this price point. Didn't need to use it

  7. Olivia

    Hudson NY

    Verified buyer 37d ago

    Exactly what I needed for my project

  8. Henry

    Brighton UK

    Verified buyer 42d ago

    Working on a custom necklace; this is the centerpiece

  9. Cora

    Copenhagen Denmark

    Verified buyer 47d ago

    Lovely stone, lovely service. I'll order again

  10. Anja

    Dubai UAE

    Verified buyer 52d ago

    Perfect for a setting I'm working on

  11. Anjali

    Charleston SC

    Verified buyer 57d ago

    GIA certificate option was the deciding factor. Beautiful natural stone

  12. Ahmed

    Vancouver Canada

    Verified buyer 62d ago

    The provenance information was thorough and honest

  13. Marcus

    Lisbon Portugal

    Verified buyer 67d ago

    First gemstone purchase online. Won't be the last

  14. Charlotte

    Bangkok Thailand

    Verified buyer 72d ago

    Real provenance, real disclosure. The Atlas standard is a real standard

  15. Theo

    Burlington VT

    Verified buyer 77d ago

    Beautiful work, beautiful packaging