Global Shipping
Combine your items!
Gemstone Expert
20+ years experience
Secure
Safe Packaging
Risk Free
30-Day Returns
8.45 ct NORBERGITE IN DIOPSIDE - MADAGASCAR
SKU: DIOP0009 | Location: Vault 1
verified
- ✓ Expert Verified Gemstone
- ✓ Fast Handling & Shipping
- ✓ Secure Vault Packaging
Norbergite is a gemstone that brings a spark of brilliant, sunny energy to the humite group. A magnesium silicate with fluorine, it is the rarest member of its mineral family, and I have always been captivated by its vibrant "citrus" personality. It typically presents in shades of bright yellow, honey-orange, or a warm, tan-brown. What truly sets it apart for me is its cleanliness; when you find a gem-grade crystal, it possesses a vitreous luster and a clarity that feels incredibly light and airy. It is a stone for the specialist—a mineral that often hides within humble limestone but reveals a spectacular, glowing interior when properly cut and polished. It is a sophisticated rarity that represents the refined chemistry of contact metamorphism.
The Heritage & Discovery
Historical Significance: Norbergite is the "simple" end-member of the humite series, but its rarity makes it anything but basic. Historically, it has been a significant indicator mineral for geologists studying the interaction between hot, mineral-rich fluids and carbonate rocks like marble. It represents a specific "low-silica" environment where fluorine played a key role in the crystal's birth. In the world of rare gems, it is prized for its intense fluorescence and its bright, cheerful colors, standing as a testament to the hidden beauty that can be found in the rugged iron and marble mines of the world.
Discovery: The mineral was first described in 1926 and was named after its type-locality: the Östanmossa Mine in Norberg , Sweden. Its discovery was pivotal for mineralogists, as it completed the understanding of the humite group's chemical progression. Since then, it has remained a hallmark of "Scandium-style" mineralogy, though the most beautiful gem-quality pieces have since been found in much warmer climates.
Important Mines: While it was born in Sweden , the most spectacular, gem-quality Norbergite today comes from the Mogok Stone Tract in Myanmar (Burma) . These legendary mines produce crystals with the best transparency for faceting. I also have a high regard for the classic specimens found in the Franklin and Sterling Hill mines in New Jersey, USA, which are world-famous for their fluorescence. For the vault, I prioritize the Mogok material for its faceting potential and the New Jersey material for its historic mineralogical significance.
Mineralogical Profile
Description: Norbergite is a magnesium silicate fluoride that crystallizes in the orthorhombic system. It sits at a 6 to 6.5 on the Mohs scale , making it durable enough for most jewelry applications, provided it is handled with the respect due to a rarity. It is characterized by its vitreous luster and its typically yellow-to-orange hue.
One of its most identifying—and exciting—traits is its fluorescence. Under short-wave UV light, many Norbergite specimens glow with a brilliant, vivid yellow or golden-orange . This "inner light" is a hallmark of the species and makes it a favorite for "glow-stone" collectors. It has a moderate refractive index ($n \approx 1.56$ to $1.59$), which gives it a bright, clean appearance when faceted. Because it is an orthorhombic mineral, it can show a subtle pleochroism, shifting slightly in tone as you rotate it. It is a dense, stable mineral that captures the warmth of a sunbeam in a crisp, crystalline form.
Chemical Formula: Mg 3 (SiO 4 )(F,OH) 2
Gemstone Specifications
| Gem Variety | Norbergite in Diopside |
| Origin | Madagascar |
| Weight | 8.45 carats |
| Color | Multicolor |
| Dimensions | 12.9 mm x 12.8 mm x 7.6 mm |
| Shape | Cushion |
| Treatment | No treatment |
| Certificate | On Request |
Verified history from our original eBay account.
Secure Global Logistics To ensure total legal compliance and security for high-value assets, all logistics are managed by my authorized agent in Bangkok: Asama James (Business Reg: 3100905529191).
- Origin: Items are dispatched directly from our secure facility in Bangkok, Thailand.
- Dispatch Time: We ship within 1-3 business days of cleared payment.
- Combined Shipping: We offer combined shipping for multiple acquisitions. Please request a "Combined Invoice" before completing payment to receive your shipping discount.
- Customs & Duties: International buyers are responsible for any import duties, taxes, or VAT charged by their destination country. These are not included in the item or shipping price.
100% Collector Satisfaction Guarantee I stand behind the scientific accuracy and quality of every stone in the vault.
- Returns: We accept returns within 30 days of receipt.
- Condition: The gemstone must be returned in its original, unaltered condition.
- Resolution: If you encounter any issues with your acquisition, please message me directly. My goal is to work out a solution that ensures you are 100% satisfied with your experience.
Secure Payment. We accept all major payment methods through eBay's secure checkout system, including Credit Cards, PayPal, Apple Pay, and Google Pay.
Personal Verification & Certification
- Identity: Every stone is personally inspected by me. I take scientific accuracy seriously; however, with hundreds of species in the vault, I remain open to professional dialogue and corrections from fellow gemologists.
- Laboratory Certification: For "Investment Grade" stones, certifications from world-renowned labs (AIGS, GRS, etc.) can be obtained upon request.
- Note: Lab processing can take up to 2 months.
- Costs: The buyer covers lab fees; a copy of the official laboratory invoice will be provided for transparency.
- Visual Accuracy: We utilize professional macro-photography to reveal the "soul" of the gem. While monitor settings may vary, we strive for 100% visual fidelity to the stone's true appearance.
Welcome to Freakingcat's Private Vault
20 Years of Expertise | 15,600+ Positive Reviews | 100% Feedback
Known to the eBay community since 2003 as Freakingcat, I have spent two decades curated a premier private collection of rare minerals. Now based in Bangkok, Thailand—the heart of the gem trade—I am offering these hand-selected specimens to you directly.
Note on our New Account: eBay policies prevent me from transferring my historical feedback to this Thai-based venture. While our score starts fresh, my legacy of trust remains.
Secure & Professional: To ensure full legal compliance and global shipping reliability, all logistics are managed by my trusted agent and partner of 20 years, Asama James (Business Reg: 3100905529191).
The account is new; the passion and expertise are 20 years deep. Welcome to the Vault.