*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: It is with genuine pride that I have the pleasure of presenting what stands as the largest diamond currently within our collection, a commanding and deeply expressive natural grey diamond that fully justifies the name Goliath. This is not merely a crystal of carbon, but a presence, a compact monument shaped in silence beneath the Earth’s mantle and delivered intact to the surface, bearing the quiet authority of geological time. Goliath reveals itself not through flamboyant colour, but through mass, density, and an almost architectural solidity. With dimensions of 7 × 6 × 5 mm and a weight of 0.32 grams, approximately 1.60 carats, the crystal carries substantial volume for a natural rough diamond, its form leaning toward a softened triangular outline, suggestive of an octahedral origin gently reshaped by natural resorption. The edges are rounded, the planes subtly curved, as though the crystal passed through immense pressure and heat that softened its geometry without diminishing its integrity. The grey tone is neither flat nor lifeless. Under frontal light it displays a metallic graphite nuance, cool and composed, while under backlighting it transforms, revealing internal translucency and layered structural depth. Light penetrates the body unevenly, exposing zones of varying density, growth patterns, and internal structural textures. This chromatic character is the result of lattice distortions and microscopic structural irregularities within the carbon framework, phenomena that influence light absorption and scattering, producing the distinctive grey appearance. Unlike surface staining or external inclusions, this colour is intrinsic, born from the atomic architecture of the crystal itself. Its lustre is unmistakably adamantine. Even across raw, unpolished surfaces, reflections appear sharp and bright, catching light in fragmented flashes rather than polished brilliance. The natural crystalline relief creates a dynamic interaction with illumination, particularly in the backlit images where the stone appears almost internally illuminated, its core subtly glowing through the grey body. There are no signs of artificial intervention. No polishing, no reshaping, no enhancement. The surfaces retain their geological authenticity, with natural micro relief and growth textures that speak clearly of their origin. The form suggests an original octahedral growth habit that has undergone partial natural dissolution, a process common in kimberlitic ascent, where crystals are chemically modified during transport from mantle depths. Recovered from the diamond rich region of Lunda Norte, Angola, this specimen carries the geological legacy of one of Africa’s most significant diamond producing provinces. The alluvial systems of this region have preserved crystals that retain their original character, allowing us to observe diamond not as a gemstone shaped by human design, but as a mineral born of extreme pressure, temperature, and deep Earth chemistry. Goliath is not defined by colour saturation alone, but by presence. By mass. By authenticity. It is a natural grey diamond whose value lies in its scale, structural honesty, and unmistakable adamantine character. Specifications: • Weight: 0.32 g • Weight in carats: 1.60 ct • Dimensions: 7 × 6 × 5 mm • Origin: Lunda Norte, Angola • Gem material: Natural diamond • Crystal system: Cubic • Crystal habit: Originally octahedral, partially resorbed with softened triangular morphology • Colour: Natural grey • Colour distribution: Even with internal tonal variation visible under backlight • Transparency: Translucent to semi translucent • Lustre: Adamantine • Surface features: Natural growth textures and resorption features • Condition: Natural rough, unpolished, untreated Notable Points: • Largest diamond currently within the collection, offering significant physical presence and volumetric impact for a natural rough crystal. • Distinct natural grey coloration generated by internal lattice distortions and structural irregularities rather than superficial staining, providing geological authenticity to the hue. • Strong adamantine lustre visible even across raw, unpolished surfaces, demonstrating the inherent optical strength of diamond in its natural state. • Translucent behaviour under backlighting, revealing internal structural zoning and depth, adding dimensionality beyond surface appearance. • Morphology suggestive of an originally octahedral crystal modified by natural mantle resorption, enhancing geological character. • Compact, robust formation with softened triangular outline that reinforces visual mass and balance. • Fully natural specimen with no signs of mechanical alteration, polishing, or treatment. • Provenance from Lunda Norte, Angola, one of Africa’s most historically significant diamond regions. • Internal structural features visible under illumination, offering educational and mineralogical value beyond aesthetics. • Exceptional example of diamond in its honest, uncut geological form, combining scale, structure, and intrinsic colour. Collector’s Interest: Natural grey diamonds of this size in original rough form offer collectors a compelling balance between scale and authenticity. The intrinsic grey tone, generated by atomic scale structural variation within the carbon lattice, provides mineralogical depth that goes beyond surface colour alone. Its substantial carat weight, combined with visible internal behaviour under light, positions this specimen as a serious addition to any advanced collection focused on untreated, structurally expressive diamonds. Goliath stands as both a display piece and a geological study specimen, embodying the quiet strength of mantle formed carbon preserved in its natural state. Lapidary Potential: While its greatest value may lie in preservation as a natural specimen, the crystal presents intriguing lapidary considerations. The internal translucency and consistent grey body colour suggest the possibility of producing a distinctive grey diamond with metallic undertones if carefully oriented and cut. However, any intervention would permanently alter the natural morphology and erase the geological narrative preserved in its raw surfaces. Whether maintained as a collector specimen or considered for selective lapidary planning, the stone offers significant potential grounded in scale, intrinsic colour, and structural integrity. ——————- Shipping and Handling: All orders are shipped by Portuguese National Post. • Dispatch time: within 1 to 3 business days after payment confirmation to Catawiki • Transit time with CTT service: between 5 to 7 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