「ブラックパール」ダイヤモンド • 保留なし価格 • 希少な色と形態 - Height: 5 mm - Width: 5 mm- 0.14 g - (1)

DESCRIPTION:
Midnight given form. Silver awakened across its surface. This natural rough diamond draws its character from a deep black appearance and a striking interplay of dark contours and brilliant reflections. Like a black pearl carrying the texture of a rocky coastline, it combines a compact silhouette with an intricate exterior that reveals new details as the light moves.

Black establishes the visual foundation. Its opaque body creates a rich background against which silver grey and graphite reflections become especially prominent. Some areas remain dark and subdued, while neighbouring planes catch the illumination sharply, creating a compelling contrast across the specimen.

Its rounded to irregular natural form lends the diamond a sculptural presence. Softer contours meet angular transitions, giving the outline an organic character without imposing a perfectly symmetrical shape. This balance allows the specimen to present different arrangements of surfaces from several viewing directions.

The comparison with a black pearl comes from its dark lustre and compact presence. Here, that impression is enriched by the rough exterior, where uneven planes, shallow depressions and fine surface lines introduce detail across the body. The result is a visual identity that feels both restrained and expressive.

Broader reflective areas form an important part of this character. Under suitable illumination, they develop a silvery sheen that reveals finer textures across their surfaces. Between them, smaller planes generate concentrated flashes, while darker recesses emphasise changes in relief.

The lustre gives the specimen its sense of movement. As the viewing angle changes, bright reflections shift from one area to another, briefly outlining an edge or illuminating a textured passage. The black body remains the constant visual anchor beneath this changing arrangement of highlights.

Its opacity directs attention towards the exterior. Shape, texture and reflection become the principal attractions, allowing the observer to appreciate how much visual complexity can emerge from a predominantly monochromatic palette. Deep black, charcoal, graphite and silver grey create an engaging range of apparent tones through their response to light.

According to the provenance information transmitted by the previous collector, the specimen originates from Lunda Norte, Angola. Presented in its rough, unpolished state, it combines a deep black appearance with reflective surface relief and a rounded to irregular form.

This is a specimen whose appeal develops through contrast. The darkness gives it presence, the lustre gives it energy, and the textured exterior gives the eye a reason to return.

SPECIFICATIONS:
• Weight: 0.14 g
• Weight in carats: 0.70 ct
• Dimensions: 5 × 5 × 4.5 mm
• Origin: Lunda Norte, Angola, according to the provenance information transmitted by the previous collector
• Gem material: Natural diamond
• Crystal form: Natural rough diamond
• Morphology: Rounded to irregular compact natural form
• Colour: Deep black
• Colour distribution: Broadly uniform black appearance
• Transparency: Opaque
• Lustre: Adamantine with metallic reflections
• Surface features: Irregular reflective planes, textured areas, shallow depressions and fine surface lines
• Internal structure: Not visually assessable through the opaque body
• Treatment: Natural, but not laboratory tested
• Condition: Natural, unpolished rough diamond
• Documentation: This diamond is not accompanied by any type of document.

NOTABLE POINTS:
• Deep Black Visual Identity
An intense black appearance gives the specimen a strong foundation, creating a rich contrast with the brighter reflections across its exterior.

• Silver Grey and Graphite Highlights
Illuminated surfaces introduce a refined range of apparent tones, from subdued graphite to bright silver grey.

• Evocative Black Pearl Character
The dark lustre and compact form recall the visual presence of a black pearl, enriched here by a textured rough crystalline exterior.

• Rounded to Irregular Morphology
Organic contours meet angular transitions, giving the specimen a sculptural outline that can be appreciated from several perspectives.

• Strong Adamantine Lustre
Sharp reflections bring individual surface features into focus and lend brightness to the otherwise dark composition.

• Metallic Reflective Appearance
Broader illuminated areas develop a silvery sheen that contrasts with the black body and emphasises the direction of the exposed planes.

• Intricate Surface Texture
Fine lines, uneven passages and shallow depressions create a detailed exterior that rewards close observation.

• Broad Reflective Planes
Larger surfaces provide clear areas of reflection, allowing their finer textures to become visible under suitable lighting.

• Concentrated Points of Brilliance
Smaller planes catch the light independently, introducing crisp flashes between the broader reflective areas.

• Expressive Light and Shadow
Bright exposed surfaces alternate with darker recesses, reinforcing the depth and three dimensional character of the rough form.

• Uncut and Unpolished Presentation
The existing contours and textured exterior remain central to the specimen’s appeal, preserving its rough presentation.

• Angolan Provenance
Lunda Norte, Angola, according to the provenance information transmitted by the previous collector.

COLLECTOR’S INTEREST:
The appeal of this black rough diamond lies in the relationship between its dark appearance and the detail revealed by reflected light. Its opaque body provides a strong visual foundation, while the exterior offers a varied arrangement of planes, textures and contours for the collector to examine.

The restrained palette gives those details particular importance. Silver grey reflections can reveal a broad surface in one orientation, while a slight rotation returns that area to darkness and brings another feature forward. This shifting emphasis makes the specimen engaging across several viewing angles.

Its Black Pearl character provides an evocative visual association. The compact form and dark lustre establish that impression, while the irregular exterior gives it a distinct mineral character. Broad reflective passages and more finely textured areas contribute equally to the overall composition.

For collectors drawn to rough diamonds, dark minerals or specimens with expressive surface relief, this piece offers a focused study in contrast. Its interest comes from the combination of black colour appearance, sculptural form and changing reflections across an unpolished exterior.

The provenance attributed to Lunda Norte adds geographical context to a specimen whose strongest visible qualities are its lustre, texture and compact presence. Preserving it in its current form retains the relationship between these features.

LAPIDARY POTENTIAL:
This natural rough diamond may offer potential for jewellery design, polishing, faceting or preservation in its original form. However, as the origin, distribution and stability of the colour have not been laboratory determined, colour retention during cutting, polishing or any other lapidary procedure cannot be guaranteed. Any lapidary work should be assessed and carried out by a qualified professional, taking into consideration the internal structure, inclusions and colour distribution of the specimen.

Its opacity limits direct visual assessment of the interior, making professional examination particularly relevant before any proposed alteration. The existing rough weight alone does not establish the achievable yield or suitability for a particular finished design.

Preservation would retain the textured exterior, irregular contours and reflective planes that define its present appearance. These features provide a compelling basis for appreciation as a rough collector specimen.

A bespoke mount designed around the existing form could offer another presentation while leaving the principal surfaces visible. Such an approach would allow the deep black appearance and silver grey reflections to remain the central attraction.

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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.

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These charges are not included in the auction price or shipping cost and are determined by the buyer’s local authorities.

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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