Sunstone from India, hand-graded by The Stone Atlas, lot XA8
Origin Karur, India
Mohs hardness 66.5 / 10
12345678910
Fingernail (2.5) Steel knife (5.5) Diamond (10)

Stone properties

What this stone is, geologically

Crystal system
Monoclinic / triclinic (feldspar group)
Mohs hardness
6 – 6.5
Specific gravity
2.55–2.76
Refractive index
1.518–1.541
Transparency
Transparent to translucent
Durability
Good — settings should protect edges

Feldspar minerals showing adularescence (moonstone), aventurescence (sunstone), or color from copper (amazonite).

The lot

Full description

A hand-graded cabochon of sunstone from Karur, India, calibrated to the 19–29 mm working range. Sold as a single piece, weighed in carats, treatments disclosed.

About this lot

Origin: Karur, India.

Format: One specific cabochon, weighing approximately 56 ct, hand-graded from a parent lot of 391 ct. Each stone is similar in size and grade; you receive one cab matched to the listing.

Size: 19–29 mm.

Weight: ~56 ct per piece.

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

Suggested use

Pendant settings, statement rings, or display — adularescence and aventurescence show best in slow light.

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 Sunstone 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 Karur, India.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: 19–29 mm. Listed weight: 56 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.

4.6 out of 5

25 verified buyers

What buyers say

  1. Priya

    Munich Germany

    Verified buyer 82d ago

    Real natural inclusions, just like the listing said

  2. Layla

    Kyoto Japan

    Verified buyer 87d ago

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

  3. Emma

    Marrakech Morocco

    Verified buyer 92d ago

    Tracking notifications were perfect. Always knew where my order was

  4. Lucas

    Bend OR

    Verified buyer 97d ago

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

  5. Ruth

    Paris France

    Verified buyer 102d ago

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

  6. Klara

    Helsinki Finland

    Verified buyer 107d ago

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

  7. Jun

    São Paulo Brazil

    Verified buyer 112d ago

    Beautiful. Will order again

  8. Renata

    Taos NM

    Verified buyer 117d ago

    Stone is exactly the size and weight described

  9. Zola

    London UK

    Verified buyer 122d ago

    Beautiful color in natural light. Lamp light brings out a different character

  10. Isabella

    Brussels Belgium

    Verified buyer 127d ago

    Arrived faster than expected, tracked the whole way. The kraft box with the wax seal is a beautiful touch

  11. Jonas

    Melbourne Australia

    Verified buyer 132d ago

    Atlas standard is real. Treatment honesty matters

  12. Ines

    Madison WI

    Verified buyer 137d ago

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

  13. Yuki

    Portland ME

    Verified buyer 142d ago

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

  14. Mateo

    Barcelona Spain

    Verified buyer 147d ago

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

  15. Tinashe

    Mumbai India

    Verified buyer 152d ago

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

  16. Noah

    Bozeman MT

    Verified buyer 157d ago

    Slightly smaller than I imagined but the quality is great

  17. Abigail

    Jackson WY

    Verified buyer 162d ago

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

  18. Henrik

    Vienna Austria

    Verified buyer 2d ago

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

  19. Matteo

    Seoul Korea

    Verified buyer 7d ago

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

  20. Rohan

    Portland OR

    Verified buyer 12d ago

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

  21. Nour

    Chapel Hill NC

    Verified buyer 17d ago

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

  22. Mia

    Lyon France

    Verified buyer 22d ago

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

  23. Owen

    Reykjavik Iceland

    Verified buyer 27d ago

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

  24. Iris

    Buenos Aires Argentina

    Verified buyer 32d ago

    Bought as a 10-year anniversary gift. Stunning

  25. Niels

    Provincetown MA

    Verified buyer 37d ago

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