**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 the deep core of a glacier where ancient blue ice holds centuries of compressed light, this exceptional natural diamond reveals a colour of rare depth and quiet intensity. Immediately following this impression comes its presence, as this is a notably large crystal for its category, standing among the largest diamonds ever presented by GemPulse Minerals, with a substantial and highly impactful 6 × 5 × 5 mm form. Its colour is nothing short of extraordinary. A deep ice blue tone dominates the crystal, carrying a subtle internal darkness that is not dull, but instead rich and immersive, as if the colour exists beneath the surface rather than on it. This is not a superficial blue, but one that feels contained within the structure of the diamond itself, evoking depth, stillness and compressed natural energy. The morphology presents a beautifully balanced rounded freeform structure, with a natural elegance that enhances its visual presence. The form is organic yet harmonious, with softly merging surfaces that create a sculptural quality when observed from different angles. The surface is composed of complex natural textures, where micro crystalline formations and subtle growth patterns interact dynamically with light. These micro structures create a lively scattering effect, producing flashes of adamantine lustre that contrast with deeper, more saturated zones of colour. One of the most remarkable aspects of this specimen is its behaviour under backlighting. When light is introduced from behind, the diamond transforms dramatically. The internal body becomes more vivid, revealing a luminous blue intensity that amplifies the sense of depth and gives the crystal an almost internal glow. This effect reinforces the impression of compressed light within the stone, directly echoing the glacial metaphor. Transparency is moderate, allowing partial transmission of light that enhances the internal colour without diminishing its richness. The result is a balance between depth and luminosity, where the blue remains strong, clean and highly expressive. Recovered from the alluvial diamond fields of Lunda Norte in Angola, this specimen remains completely natural, unpolished and untreated. It preserves both its original morphology and one of the most compelling colour expressions found in natural rough diamonds. This is not simply a blue diamond. It is a rare convergence of scale, colour and natural form, where size amplifies presence and colour defines identity. Specifications: • Weight: 0.15 g • Weight in carats: 0.75 ct • Dimensions: 6.5 × 5 × 4 mm • Origin: Lunda Norte, Angola • Gem material: Natural diamond • Crystal form: Natural rough crystal • Morphology: Rounded freeform crystal • Colour: Deep ice blue • Colour distribution: Even with internal tonal depth • Transparency: Translucent • Lustre: Adamantine • Surface features: Natural growth textures and micro crystalline relief • Condition: Natural, unpolished, untreated Notable Points: • Exceptional size for a coloured rough diamond Significantly larger than typical specimens, with strong physical and visual presence. • Deep ice blue colour Displays a saturated blue tone with internal depth rather than surface colouration. • Glacier core visual character Colour evokes compressed light within ancient ice, creating a sense of depth and stillness. • Elegant rounded freeform morphology Balanced and organic shape enhances display from multiple angles. • Strong response to backlighting Internal colour becomes more vivid and luminous when illuminated from behind. • Natural colour purity Blue remains clean and expressive without grey or muddy undertones. • Micro crystalline surface texture Complex natural textures enhance light interaction and visual richness. • Adamantine lustre expression Multiple reflective planes produce dynamic light response. • Partial translucency Allows light penetration that enhances internal colour depth. • Fully natural specimen No cutting, no polishing, no treatment. • Angolan alluvial origin Consistent with coloured diamond material from Lunda Norte. • Strong three dimensional presence Volume and morphology create a powerful visual impact. • Rare colour category Blue diamonds in natural rough form are highly uncommon. • High display value Excellent behaviour under controlled lighting conditions. • Collector grade specimen Combines size, colour and natural integrity in a single piece. Collector’s Interest: Blue diamonds occupy a unique position within the world of natural gemstones, particularly when their colour is expressed in rough form rather than through cutting. This specimen elevates that rarity further through its size, which is highly unusual for a coloured diamond of this nature. The combination of deep internal blue, translucency and strong morphology creates a piece that is both visually powerful and geologically meaningful. It offers collectors an opportunity to observe colour not as a surface effect, but as an intrinsic property of the crystal itself. For those focused on natural coloured diamonds, this is a specimen that stands out not only for its rarity, but for its presence. Lapidary Potential: Although cutting could be considered due to its size and colour, any intervention would result in loss of material and would remove the natural surface features that contribute to its identity. In its current form, the diamond offers greater value as a preserved natural specimen or as a unique centrepiece for high end jewellery, particularly in bespoke rings or pendants where its size and colour can be fully showcased. Its highest value lies in its natural state, where scale, colour and structure remain fully intact. ——————- 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