**Complimentary Specimens** As a gesture of appreciation, winning lots with a final hammer price above €50 will include one small additional mineral offered entirely free of charge. —————— Description: Like a natural shard of frozen metallic light, shaped into a compact triangular mass, this remarkable diamond presents a geometry that is both sharply defined and softly sculpted by time. Its form immediately captures attention, not as a flat triangular plate, but as a fully volumetric crystal where thickness, depth and structure give true three dimensional presence to its silhouette. The triangular morphology is the defining feature of this specimen, yet it is far from rigid or planar. Each edge flows subtly into the next, with rounded transitions that soften the geometry without erasing its angular identity. The result is a rare balance between geometric clarity and natural erosion, where the crystal appears both structured and organic at the same time. Its colour displays a refined grey tone with metallic undertones, shifting between soft silver and deeper graphite depending on the angle of observation. This chromatic neutrality enhances the perception of form, allowing light interaction and surface structure to take visual priority over colour saturation. The surface reveals pronounced growth striations, particularly visible along the triangular faces, where linear textures run with clear directional consistency. These natural markings act as a record of crystallisation, adding both visual rhythm and geological authenticity to the specimen. Light interaction is especially compelling. Rather than relying on transparency, the diamond expresses itself through reflection and scattering. The adamantine lustre is present across multiple micro planes, producing sharp flashes that contrast with darker internal zones. Under stronger illumination, the crystal develops a subtle internal glow, reinforcing its metallic character without losing depth. The base of the crystal appears slightly more diffuse, with a faintly lighter tone that suggests variation in density or internal structure. This contrast between the more defined upper triangular faces and the softer lower zone enhances the perception of volume and grounding. Recovered from the alluvial deposits of Lunda Norte, Angola, this specimen remains completely natural, unpolished and untreated. It preserves a rare morphological expression where triangular geometry and volumetric integrity coexist in a highly unusual and visually striking form. This is not simply a grey diamond. It is a sculptural crystal where geometry, texture and light converge into a singular natural presence. Specifications: • Weight: 0.13 g • Weight in carats: 0.65 ct • Dimensions: 5 × 5 × 3 mm • Origin: Lunda Norte, Angola • Gem material: Natural diamond • Crystal form: Natural rough crystal • Morphology: Triangular volumetric crystal with rounded edges • Colour: Grey with metallic undertones • Colour distribution: Even with subtle tonal variation • Transparency: Translucent to semi opaque • Lustre: Adamantine with reflective intensity • Surface features: Pronounced linear growth striations and micro crystalline textures • Condition: Natural, unpolished, untreated Notable Points: • Distinct triangular morphology with true three dimensional volume This is not a flat triangular fragment but a fully developed crystal with depth and structural mass, giving it strong physical presence • Balanced geometry with softened transitions Edges and faces retain angular identity while merging through natural rounding, creating harmony between structure and organic formation • Metallic grey colour expression Displays refined grey tones with silver and graphite nuances that shift depending on lighting conditions • Strong linear growth striations Clearly visible directional textures enhance both visual structure and geological authenticity • High quality adamantine lustre Multiple reflective planes produce sharp, bright flashes even without high transparency • Light driven visual behaviour The stone responds dynamically to illumination, with reflections dominating over transmission • Subtle internal tonal zoning Variations between upper and lower zones add depth and reinforce three dimensional perception • Compact and well balanced proportions The 5 × 5 × 3 mm format creates a stable and aesthetically pleasing volume • Fully natural untreated specimen No cutting, no polishing, preserving original geological features • Angolan alluvial origin Consistent with diamond material known for diverse morphologies and natural surface preservation • Rare triangular crystal habit Such defined triangular forms with volumetric integrity are uncommon in natural rough diamonds • Strong sculptural presence The crystal reads as an object of form, not just a mineral specimen Collector’s Interest: Diamonds that deviate from classic octahedral or cubic expressions hold particular interest among collectors, especially when the morphology remains both recognisable and structurally complete. This specimen offers precisely that rarity. Its triangular geometry is not superficial but integral to its formation, reinforced by thickness and volume. This transforms the piece from a simple curiosity into a true morphological standout. The combination of metallic grey tones, strong surface textures and defined geometry creates a specimen that appeals equally to aesthetic collectors and those interested in crystallography. It is a piece that communicates structure before colour, and presence before brilliance. Lapidary Potential: While the material could theoretically be cut, doing so would significantly reduce both its size and its defining morphological identity. The triangular volumetric structure would be lost, along with the natural growth striations that give the crystal its character. In its current form, the diamond holds far greater value as a natural specimen. It represents a rare example where geometry, volume and surface history remain intact, offering a complete expression of natural crystal formation that would not survive any form of transformation. ——————- 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