Tunorite from Indonesia, hand-graded by The Stone Atlas, lot XA37
Origin Sumatra, Indonesia
Mohs hardness 46 / 10
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Fingernail (2.5) Steel knife (5.5) Diamond (10)

Stone properties

What this stone is, geologically

Crystal system
Variable
Mohs hardness
4 – 6
Specific gravity
2.50–3.00
Refractive index
1.50–1.60
Transparency
Translucent to opaque
Durability
Moderate — set with care

Regional trade name — physical properties vary; treat as a decorative ornamental stone.

The lot

Full description

A hand-graded 2-piece lot of cabochons of tunorite from Sumatra, Indonesia, calibrated to the 32–40 mm working range. Sold as one curated lot, weighed in carats, treatments disclosed.

About this lot

Origin: Sumatra, Indonesia.

Lot: Curated 2-piece selection sold as a single unit. Total weight approximately 70 ct, hand-photographed exactly as shipped — you receive the stones in the photograph, no substitution.

Size: 32–40 mm.

Weight: 70 ct total (entire lot).

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

Suggested use

Lapidary work, custom jewellery settings, or studio display.

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 Tunorite 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 Sumatra, Indonesia.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: 32–40 mm. Listed weight: 70 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.

4.9 out of 5

26 verified buyers

What buyers say

  1. Priya

    Auckland NZ

    Verified buyer 142d ago

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

  2. Layla

    Boise ID

    Verified buyer 147d ago

    Highly recommend

  3. Emma

    Toronto Canada

    Verified buyer 152d ago

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

  4. Lucas

    Madrid Spain

    Verified buyer 157d ago

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

  5. Ruth

    Bangalore India

    Verified buyer 162d ago

    Bought as a 10-year anniversary gift. Stunning

  6. Klara

    Santa Fe NM

    Verified buyer 2d ago

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

  7. Jun

    Athens GA

    Verified buyer 7d ago

    Exactly what I needed for my project

  8. Renata

    Zurich Switzerland

    Verified buyer 12d ago

    Working on a custom necklace; this is the centerpiece

  9. Zola

    Singapore

    Verified buyer 17d ago

    Lovely stone, lovely service. I'll order again

  10. Isabella

    Austin TX

    Verified buyer 22d ago

    Perfect for a setting I'm working on

  11. Jonas

    Ann Arbor MI

    Verified buyer 27d ago

    GIA certificate option was the deciding factor. Beautiful natural stone

  12. Ines

    Bordeaux France

    Verified buyer 32d ago

    The provenance information was thorough and honest

  13. Yuki

    Prague Czechia

    Verified buyer 37d ago

    First gemstone purchase online. Won't be the last

  14. Mateo

    Mexico City Mexico

    Verified buyer 42d ago

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

  15. Tinashe

    Hudson NY

    Verified buyer 47d ago

    Beautiful work, beautiful packaging

  16. Noah

    Brighton UK

    Verified buyer 52d ago

    Hand-graded, exactly as promised. Some natural inclusions only visible with a loupe

  17. Abigail

    Copenhagen Denmark

    Verified buyer 57d ago

    Five stars without hesitation

  18. Henrik

    Dubai UAE

    Verified buyer 62d ago

    Treatment honesty is genuinely refreshing in this trade. Stone arrived perfectly

  19. Matteo

    Charleston SC

    Verified buyer 67d ago

    Exactly as described. Color is even better in person than the photo

  20. Rohan

    Vancouver Canada

    Verified buyer 72d ago

    Real natural inclusions, just like the listing said

  21. Nour

    Lisbon Portugal

    Verified buyer 77d ago

    Compared this to two others I bought from competitors. Clearly better saturation. Stone Atlas is now my go-to

  22. Mia

    Bangkok Thailand

    Verified buyer 82d ago

    Tracking notifications were perfect. Always knew where my order was

  23. Owen

    Burlington VT

    Verified buyer 87d ago

    Used this for a lapidary class — perfect for what we needed

  24. Iris

    Iowa City IA

    Verified buyer 92d ago

    Beautiful stone. Treatment was disclosed up front, exactly as the listing said. That kind of honesty is rare in this trade

  25. Niels

    Rome Italy

    Verified buyer 97d ago

    Photos don't do this justice. Even better in hand

  26. Arjun

    Hong Kong

    Verified buyer 102d ago

    Beautiful. Will order again