Silk Moonstone from India, hand-graded by The Stone Atlas, lot XA35
Origin Karnataka, India
Mohs hardness 66.5 / 10
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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 2-piece lot of cabochons of silk moonstone from Karnataka, India, calibrated to the 28–34 mm working range. Sold as one curated lot, weighed in carats, treatments disclosed.

About this lot

Origin: Karnataka, India.

Lot: Curated 2-piece selection sold as a single unit. Total weight approximately 121 ct, hand-photographed exactly as shipped — you receive the stones in the photograph, no substitution.

Size: 28–34 mm.

Weight: 121 ct total (entire lot).

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 Silk Moonstone 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 Karnataka, 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: 28–34 mm. Listed weight: 121 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

20 verified buyers

What buyers say

  1. Valentina

    Lexington KY

    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. Sarah

    Florence Italy

    Verified buyer 12d ago

    Highly recommend

  3. Mason

    Taipei Taiwan

    Verified buyer 17d ago

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

  4. Maya

    Asheville NC

    Verified buyer 22d ago

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

  5. Eleni

    Park City UT

    Verified buyer 27d ago

    Bought as a 10-year anniversary gift. Stunning

  6. Aiko

    Munich Germany

    Verified buyer 32d ago

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

  7. Diego

    Kyoto Japan

    Verified buyer 37d ago

    Exactly what I needed for my project

  8. Adwoa

    Marrakech Morocco

    Verified buyer 42d ago

    Working on a custom necklace; this is the centerpiece

  9. Ava

    Bend OR

    Verified buyer 47d ago

    Lovely stone, lovely service. I'll order again

  10. Wyatt

    Paris France

    Verified buyer 52d ago

    Perfect for a setting I'm working on

  11. Pieter

    Helsinki Finland

    Verified buyer 57d ago

    GIA certificate option was the deciding factor. Beautiful natural stone

  12. Giulia

    São Paulo Brazil

    Verified buyer 62d ago

    The provenance information was thorough and honest

  13. Carlos

    Taos NM

    Verified buyer 67d ago

    First gemstone purchase online. Won't be the last

  14. Kofi

    London UK

    Verified buyer 72d ago

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

  15. Ethan

    Brussels Belgium

    Verified buyer 77d ago

    Beautiful work, beautiful packaging

  16. Evelyn

    Melbourne Australia

    Verified buyer 82d ago

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

  17. Lukas

    Madison WI

    Verified buyer 87d ago

    Five stars without hesitation

  18. Hugo

    Portland ME

    Verified buyer 92d ago

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

  19. Kenji

    Barcelona Spain

    Verified buyer 97d ago

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

  20. Yasmin

    Mumbai India

    Verified buyer 102d ago

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