强烈棕色钻石，配有 Trigons • 无保留价 • 罕见色彩与光泽 - 高度: 4 mm - 闊度: 3.5 mm- 0.05 g - (1)

DESCRIPTION:
This natural rough diamond immediately distinguishes itself through the presence of well defined trigons across its surface, a key crystallographic feature that provides direct insight into its natural growth history.

These triangular etch patterns are clearly visible on multiple faces of the crystal, forming a complex network of geometric depressions that confirm natural dissolution and regrowth processes. Their presence adds strong mineralogical credibility and places the specimen firmly within an authentic geological context.

The crystal displays a warm brown to cognac coloration, enriched with amber undertones that become more expressive under directed light. Rather than presenting as a uniform colour, the tone is layered and internally textured, with variations in saturation that create depth and visual complexity.

Its morphology is compact and irregular, with a naturally rounded freeform structure. The shape is not sharply defined, but instead softened by natural wear and transport, consistent with alluvial origin. This results in a balanced and organic form that sits comfortably in three dimensional space.

The surface is highly textured, composed of intersecting micro faces and growth features. These create a fragmented reflective behaviour, producing scattered flashes of adamantine lustre across the stone. The reflections are subtle yet lively, enhancing the visual character without relying on transparency.

Internally, the diamond shows a dense structure with visible inclusions and natural irregularities. These internal features contribute to the stone’s identity, reinforcing its raw and unmodified nature rather than detracting from it.

Transparency remains limited, with the stone leaning towards translucent to opaque. Light interaction occurs primarily at the surface level, where reflections and colour concentration combine to produce a warm, earthy glow.

Recovered from the alluvial deposits of Lunda Norte, Angola, this specimen retains its complete natural integrity. It has not undergone any cutting, polishing or treatment, preserving both its surface features and internal structure exactly as formed in nature.

This is not a diamond defined by clarity or transparency, but by structure, texture and geological authenticity, with trigons serving as its most compelling defining feature.

SPECIFICATIONS:
• Weight: 0.05 g
• Weight in carats: 0.25 ct
• Dimensions: 4 × 3.5 × 3 mm
• Origin: Lunda Norte, Angola
• Gem material: Natural diamond
• Crystal form: Natural rough diamond
• Morphology: Rounded irregular freeform crystal
• Colour: Brown to cognac with amber undertones
• Colour distribution: Irregular and internally textured
• Transparency: Translucent to opaque
• Lustre: Adamantine
• Surface features: Well defined trigons, micro crystalline textures
• Internal features: Natural inclusions and structural irregularities
• Treatment: None
• Condition: Natural, unpolished, untreated

NOTABLE POINTS:
• Clearly visible trigons across the surface
Distinct triangular etch patterns confirming natural diamond growth and dissolution
• Warm cognac brown coloration
Rich earthy tones with amber nuances under light
• Strong surface texture
Complex micro structures enhancing mineral authenticity
• Natural rounded morphology
Form shaped by geological processes and transport
• Fragmented adamantine reflections
Multiple micro faces create subtle but lively light interaction
• Internally structured appearance
Presence of inclusions contributing to visual depth
• Authentic alluvial character
Surface wear consistent with natural deposit conditions
• Non uniform colour distribution
Natural variation enhances complexity
• Compact and balanced form
Good visual presence despite small size
• Untreated natural state
No polishing or enhancement
• Strong geological readability
Growth and dissolution features clearly expressed
• Angola provenance
Recognised source of natural rough diamonds

COLLECTOR’S INTEREST:
For collectors, the presence of trigons significantly elevates the interest of a rough diamond, as these features provide direct evidence of natural crystal evolution.

Unlike polished stones, where surface information is removed, this specimen preserves its original crystallographic markings. The trigons act as a natural record of growth and dissolution processes, making the piece particularly relevant from both a mineralogical and educational perspective.

The warm cognac colour adds an additional layer of appeal, offering a classic and recognisable tone within natural brown diamonds. Combined with its textured surface and compact form, this creates a specimen that is both visually engaging and scientifically meaningful.

This is a piece that speaks more through structure than brilliance, making it especially suited for collectors who value natural features and geological authenticity.

LAPIDARY POTENTIAL:
Cutting this specimen would result in the complete loss of its most important features, particularly the trigons and natural surface textures that define its identity.

Any transformation into a faceted stone would remove the crystallographic information preserved on the surface, significantly reducing its mineralogical value.

Its highest value lies in its preservation as a natural rough diamond, where both structure and history remain fully intact.

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Shipping and Handling:
All orders are shipped by Portuguese National Post and UPS
• Dispatch time: within 1 to 3 business days after payment confirmation to Catawiki
• Transit time service: between 2 to 5 business days within europe and worldwide, depending on destination national post.
• A tracking number is always provided

Photography and transparency:
All photographs are taken under controlled lighting conditions using a macro lens, carefully selected to present each specimen as accurately as possible.
No filters, colour enhancement, or artificial saturation are applied.
The lighting setup uses a calibrated 5500K light source, replicating neutral daylight to reveal natural tones, surface features, and internal characteristics. Under warmer or weaker indoor lighting, colours may appear slightly different, which is normal.
The purpose of this photographic process is documentation and representation, not visual enhancement. Images are intended to reflect the specimen faithfully as it appears under balanced natural light conditions.

Identification and ethics:
All specimens offered are natural and described to the best of our knowledge, based on direct sourcing, professional experience, and information provided by trusted suppliers working at the origin.
Every effort is made to ensure transparency and accuracy regarding identification, locality, and general characteristics, avoiding misleading statements about treatment, provenance, or nature.

Customs and import taxes:
Any customs duties, import fees, or local taxes applied by the destination country are entirely the responsibility of the winning bidder.
These charges are not included in the auction price or shipping cost and are determined by the buyer’s local authorities.

Guarantee and resolution:
Customer satisfaction is important. In the unlikely event of an issue such as loss, damage, or discrepancy, please contact us promptly through Catawiki’s messaging system.
Each case is handled individually and fairly, with appropriate solutions offered when justified.

Appreciation and commitment:
We sincerely thank you for your trust. Our work focuses on careful selection, accurate representation, and respectful presentation of mineral specimens with character and interest.
Each piece is chosen for its individual qualities rather than speculative or financial considerations. We aim to provide a transparent, reliable, and consistent experience for collectors at all levels.

With gratitude,
GemPulse Minerals