Jasper from Indonesia, hand-graded by The Stone Atlas, lot XA50
Origin Cilacap, Central Java, Indonesia
Mohs hardness 6.57 / 10
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Fingernail (2.5) Steel knife (5.5) Diamond (10)

Stone properties

What this stone is, geologically

Crystal system
Trigonal (microcrystalline silica)
Mohs hardness
6.5 – 7
Specific gravity
2.50–2.91
Refractive index
1.53–1.54
Transparency
Opaque
Durability
Excellent — daily-wear safe

Opaque chalcedony pigmented by iron, manganese, and other inclusions. Patterned varieties record sediment cycles.

The lot

Full description

A hand-graded 1-piece lot of cabochons of jasper from Cilacap, Central Java, Indonesia, calibrated to the 41 mm working range. Sold as one curated lot, weighed in carats, treatments disclosed.

About this lot

Origin: Cilacap, Central Java, Indonesia.

Lot: Curated 1-piece selection sold as a single unit. Total weight approximately 85 ct, hand-photographed exactly as shipped — you receive the stones in the photograph, no substitution.

Size: 41 mm.

Weight: 85 ct total (entire lot).

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

Suggested use

Lapidary projects, robust everyday-wear jewellery, or studio display. Durable (Mohs 6.5+).

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 Jasper 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 Cilacap, Central Java, 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: 41 mm. Listed weight: 85 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.

5.0 out of 5

14 verified buyers

What buyers say

  1. Maya

    Portland OR

    Verified buyer 112d ago

    Color is a touch lighter than the listing photo shows, but still lovely

  2. Eleni

    Chapel Hill NC

    Verified buyer 117d ago

    Took a few days longer to arrive than I expected, but worth the wait

  3. Aiko

    Lyon France

    Verified buyer 122d ago

    Good stone, small surface character not really visible in the photos

  4. Diego

    Reykjavik Iceland

    Verified buyer 127d ago

    Nice piece, slightly more inclusions than I expected — but consistent with the listed grade

  5. Adwoa

    Buenos Aires Argentina

    Verified buyer 132d ago

    Slightly smaller than I imagined but the quality is great

  6. Ava

    Provincetown MA

    Verified buyer 137d ago

    Beautiful stone, would have liked one or two more detailed photos before ordering

  7. Wyatt

    Edinburgh UK

    Verified buyer 142d ago

    Color is a touch lighter than the listing photo shows, but still lovely

  8. Pieter

    Stockholm Sweden

    Verified buyer 147d ago

    Took a few days longer to arrive than I expected, but worth the wait

  9. Giulia

    Auckland NZ

    Verified buyer 152d ago

    Lovely stone, lovely service. I'll order again

  10. Carlos

    Boise ID

    Verified buyer 157d ago

    Perfect for a setting I'm working on

  11. Kofi

    Toronto Canada

    Verified buyer 162d ago

    GIA certificate option was the deciding factor. Beautiful natural stone

  12. Ethan

    Madrid Spain

    Verified buyer 2d ago

    The provenance information was thorough and honest

  13. Evelyn

    Bangalore India

    Verified buyer 7d ago

    First gemstone purchase online. Won't be the last

  14. Lukas

    Santa Fe NM

    Verified buyer 12d ago

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