Just sold
·
Origin
Kayes, Mali
Mohs hardness
6–6.5
/ 10
12345678910
Fingernail (2.5)
Steel knife (5.5)
Diamond (10)
Stone properties
What this stone is, geologically
- Crystal system
- Orthorhombic
- Mohs hardness
- 6 – 6.5
- Specific gravity
- 2.80–2.95
- Refractive index
- 1.616–1.649
- Transparency
- Translucent to opaque
- Durability
- Good — daily-wear capable
Calcium-aluminum silicate forming in basaltic cavities. The fine fibrous texture gives prehnite its waxy sheen.
The lot
Full description
A hand-graded parcel of cabochons of prehnite from Kayes, Mali, calibrated to the 10–15 mm working range. Sold by the parcel, weighed in carats, treatments disclosed.
About this lot
Origin: Kayes, Mali.
Parcel: Minimum guaranteed 10 ct total weight. Each parcel typically contains 1–2 pieces within the listed size range. You pay for guaranteed weight; piece count varies because natural material isn't uniform.
Size: 10–15 mm.
Weight: Minimum 10 ct per parcel (parent lot has 57 ct available).
Treatment: None. 100% natural, untreated material. Disclosed on every listing — that's the Atlas standard.
Suggested use
Setting in jewellery — ring bezels, pendant cabochons, statement earrings. Dome and polish are jewellery-ready.
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 Prehnite 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 Kayes, Mali.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: 10–15 mm. Listed weight: 10 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
23 verified buyers
What buyers say
-
Harper
Cape Town South Africa
I've ordered from a lot of online gemstone dealers — this is the first time the stone matched the listing photo
-
Levi
Carmel CA
Highly recommend
-
Sofia
Dublin Ireland
Smaller than I imagined but quality is high — exactly as listed
-
Priya
Oslo Norway
Fast shipping, beautiful packaging, accurate listing. What more can you ask
-
Layla
Tel Aviv Israel
Bought as a 10-year anniversary gift. Stunning
-
Emma
Sedona AZ
The 30-day inspection window made me comfortable ordering at this price point. Didn't need to use it
-
Lucas
Montréal Canada
Exactly what I needed for my project
-
Ruth
Amsterdam Netherlands
Working on a custom necklace; this is the centerpiece
-
Klara
Sydney Australia
Lovely stone, lovely service. I'll order again
-
Jun
Boulder CO
Perfect for a setting I'm working on
-
Renata
Lexington KY
GIA certificate option was the deciding factor. Beautiful natural stone
-
Zola
Florence Italy
The provenance information was thorough and honest
-
Isabella
Taipei Taiwan
First gemstone purchase online. Won't be the last
-
Jonas
Asheville NC
Real provenance, real disclosure. The Atlas standard is a real standard
-
Ines
Park City UT
Beautiful work, beautiful packaging
-
Yuki
Munich Germany
Hand-graded, exactly as promised. Some natural inclusions only visible with a loupe
-
Mateo
Kyoto Japan
Five stars without hesitation
-
Tinashe
Marrakech Morocco
Treatment honesty is genuinely refreshing in this trade. Stone arrived perfectly
-
Noah
Bend OR
Exactly as described. Color is even better in person than the photo
-
Abigail
Paris France
Real natural inclusions, just like the listing said
-
Henrik
Helsinki Finland
Compared this to two others I bought from competitors. Clearly better saturation. Stone Atlas is now my go-to
-
Matteo
São Paulo Brazil
Tracking notifications were perfect. Always knew where my order was
-
Rohan
Taos NM
Used this for a lapidary class — perfect for what we needed
Recently viewed
Pick up where you left off
Prehnite
$109.00