Description: Like a fragment of deep polar ice suspended in crystalline form, this natural rough diamond displays a remarkably expressive blue appearance. The blue is clean, cold and strongly saturated, recalling the inner mass of an iceberg where light penetrates dense glacial ice and reveals an almost electric blue presence. It is a colour that feels geological and elemental, evoking frozen depths rather than surface waters. When illuminated from behind with direct light, the stone undergoes a striking visual transformation. The blue becomes brighter and more concentrated, as if the crystal were illuminated from within. This effect reveals a vivid internal glow, increasing the perception of transparency and depth while preserving the distinctive blue character of the specimen. One of the most appealing features of this diamond is its natural freeform morphology. When observed from a particular perspective, its contours create a remarkably recognisable heart shaped appearance. This naturally occurring silhouette gives the specimen an unusual personality without altering or modifying its original rough form. According to the provenance information transmitted by the previous collector, the specimen originates from Lunda Norte, Angola, one of the country’s historically important diamond producing regions. The diamond retains its original rough character, with irregular natural planes, softly rounded contours and crystalline surface textures shaped through natural geological processes. Natural growth textures and crystalline relief interact with light across the untreated looking rough surfaces, producing subtle flashes rather than the continuous brilliance associated with a polished diamond. The characteristic adamantine lustre remains clearly perceptible through multiple reflective areas across the crystal. The combination of its blue appearance, natural crystalline texture and distinctive heart shaped visual profile gives this specimen an immediately recognisable identity. Preserved in its rough state, it represents an expressive example of how colour, morphology and light can interact within a natural diamond crystal. Specifications: • Weight: 0.17 g • Weight in carats: 0.85 ct • Dimensions: 7 × 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: Natural freeform crystal with heart shaped appearance from a particular viewing angle • Colour appearance: Intense blue • Colour distribution: Concentrated blue zones with strong response to transmitted light • Transparency: Translucent • Lustre: Adamantine • Surface features: Natural growth textures and raw crystalline relief • Condition: Natural, unpolished • Treatment: Natural, but not laboratory tested • Documentation: This diamond is not accompanied by any type of document. Notable Points: • Intense blue appearance Displays a highly expressive and strongly saturated blue visual character. • Polar ice visual character Its cold blue appearance recalls the deep blue colour visible within dense glacial ice. • Strong response to transmitted light The blue becomes considerably brighter and more expressive when illuminated from behind. • Distinctive heart shaped appearance From a particular viewing perspective, the natural freeform contours create a clearly recognisable heart shaped profile. • Natural freeform morphology The unusual silhouette originates entirely from the natural form of the rough crystal. • Expressive colour concentration Different areas of the crystal interact with transmitted light to create depth and chromatic movement. • Natural crystalline texture Original growth structures and surface relief remain clearly visible throughout the specimen. • Adamantine lustre expression Multiple reflective areas reveal the characteristic lustre associated with diamond. • Natural rough state Presented uncut and unpolished. • High visual individuality The combination of blue colour and heart shaped appearance gives the specimen a particularly distinctive identity. • Angolan provenance Lunda Norte, Angola, according to the provenance information transmitted by the previous collector. • Dynamic light behaviour Its visual character changes significantly according to the direction and intensity of illumination. • Strong three dimensional presence The freeform morphology provides visual depth and character from different viewing angles. • Excellent display specimen Particularly expressive under controlled illumination and macro photography. Collector’s Interest: Rough diamonds displaying blue coloration have a particularly distinctive visual character, especially when colour interacts strongly with transmitted light and remains visible across the original crystalline surfaces. This specimen combines an intense blue appearance with an unusual natural morphology. Its most distinctive feature is revealed from a particular viewing angle, where the freeform crystal naturally assumes a recognisable heart shaped silhouette. This gives the diamond an individuality that derives entirely from its original geological form rather than from cutting or human intervention. For collectors, the combination of blue colour, natural crystalline texture, Angolan provenance according to the information transmitted by the previous collector and its distinctive heart shaped visual profile gives this rough diamond considerable character and display appeal. 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. ——————- 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