Just sold
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Origin
Anjanabonoina, Madagascar
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
- 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 microcline feldspar from Anjanabonoina, Madagascar, calibrated to the 23–54 mm working range. Sold as a single piece, weighed in carats, treatments disclosed.
About this lot
Origin: Anjanabonoina, Madagascar.
Format: One specific cabochon, weighing approximately 16 ct, hand-graded from a parent lot of 218 ct. Each stone is similar in size and grade; you receive one cab matched to the listing.
Size: 23–54 mm.
Weight: ~16 ct per piece.
Size note: Stones in the parent lot range widely from 23 mm to 54 mm (2.3× spread). The specific piece you receive may be on either end of that range — request a photo before ordering if size is critical.
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 Microcline Feldspar 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 Anjanabonoina, Madagascar.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: 23–54 mm. Listed weight: 16 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
16 verified buyers
What buyers say
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Mason
Madison WI
I've ordered from a lot of online gemstone dealers — this is the first time the stone matched the listing photo
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Maya
Portland ME
Highly recommend
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Eleni
Barcelona Spain
Smaller than I imagined but quality is high — exactly as listed
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Aiko
Mumbai India
Fast shipping, beautiful packaging, accurate listing. What more can you ask
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Diego
Bozeman MT
Bought as a 10-year anniversary gift. Stunning
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Adwoa
Jackson WY
The 30-day inspection window made me comfortable ordering at this price point. Didn't need to use it
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Ava
Vienna Austria
Exactly what I needed for my project
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Wyatt
Seoul Korea
Working on a custom necklace; this is the centerpiece
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Pieter
Portland OR
Lovely stone, lovely service. I'll order again
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Giulia
Chapel Hill NC
Perfect for a setting I'm working on
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Carlos
Lyon France
GIA certificate option was the deciding factor. Beautiful natural stone
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Kofi
Reykjavik Iceland
The provenance information was thorough and honest
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Ethan
Buenos Aires Argentina
First gemstone purchase online. Won't be the last
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Evelyn
Provincetown MA
Real provenance, real disclosure. The Atlas standard is a real standard
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Lukas
Edinburgh UK
Beautiful work, beautiful packaging
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Hugo
Stockholm Sweden
Hand-graded, exactly as promised. Some natural inclusions only visible with a loupe
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