DESCRIPTION: This remarkable tourmaline slice immediately captures attention through its naturally diffused chromatic architecture. Rather than displaying sharply defined concentric zoning, the crystal presents a beautifully blended royal blue core that dissolves organically into a lighter surrounding body, creating the impression of pigment suspended within clear crystal. The centre of the specimen is dominated by an intense royal blue to deep sapphire blue nucleus. Instead of forming a perfectly homogeneous core, the colour develops through delicate cloud like patches and feathered transitions, giving the slice exceptional visual depth and a highly organic appearance. This soft diffusion is one of the specimen’s most distinctive characteristics. Surrounding the centre, the colour gradually becomes lighter before reaching a refined bluish teal outer rim. Rather than true petroleum blue, the perimeter displays a cool blue green tone that naturally frames the specimen while preserving excellent transparency along the edges. This subtle transition between the darker interior and lighter exterior creates remarkable optical balance. The slice retains its original trigonal outline, preserving the natural geometry of the parent crystal. Fine internal growth textures remain visible throughout the specimen, while the polished section beautifully exposes the internal colour architecture that developed naturally during crystal formation. Transparency is excellent across much of the slice, particularly around the lighter peripheral areas where transmitted light reveals the crystal’s internal structure with exceptional clarity. Under illumination, the darker core appears almost suspended within the crystal, while the surrounding lighter zones enhance the overall sense of depth. The polished surfaces display an attractive vitreous lustre, while the natural crystal outline preserves the mineralogical identity of the specimen. The contrast between crisp external geometry and softly diffused internal colour produces a refined aesthetic rarely encountered in small tourmaline slices. Originating from Minas Gerais, Brazil, this specimen represents an elegant expression of Brazilian tourmaline, distinguished by its naturally blended blue colour architecture, excellent transparency and beautifully preserved crystal section. SPECIFICATIONS: • Weight: 0.15 g • Weight in carats: 0.75 ct • Dimensions: 6 × 6 × 2 mm • Origin: Minas Gerais, Brazil • Mineral species: Tourmaline • Variety: Blue Tourmaline • Crystal system: Trigonal • Form: Natural crystal slice • Core structure: Diffused Royal Blue central core • Colour zoning: Naturally diffused concentric zoning • Colour sequence: Bluish teal outer rim grading into a Royal Blue core • Transparency: Transparent to translucent • Lustre: Vitreous • Surface features: Natural internal growth textures and polished section • Treatment: None • Condition: Natural intact slice NOTABLE POINTS: • Distinct Diffused Chromatic Architecture The specimen exhibits an unusually soft colour transition, with a naturally blended Royal Blue core gradually diffusing into lighter surrounding zones. • Royal Blue Central Core The centre displays rich sapphire blue tones forming the visual focal point of the specimen. • Bluish Teal Outer Rim The perimeter develops into an elegant bluish teal border that naturally frames the slice without abrupt colour separation. • Organic Colour Distribution Rather than sharp zoning, the colours blend through cloud like transitions, creating exceptional visual depth. • Excellent Transparency Light penetrates the lighter outer areas beautifully, revealing the internal structure and enhancing colour contrast. • Attractive Optical Depth The darker core appears visually suspended within the surrounding transparent material under transmitted light. • Natural Crystal Architecture Preserved The original trigonal outline remains clearly visible, maintaining the geological identity of the parent crystal. • Fine Internal Growth Features Natural internal textures remain preserved throughout the slice, confirming its untouched geological development. • Bright Vitreous Lustre The polished surfaces display excellent vitreous reflections while preserving the natural crystal outline. • Harmonious Blue Colour Palette Multiple shades of blue interact naturally, ranging from bluish teal to vivid Royal Blue. • Minas Gerais Provenance Originating from one of the world’s premier tourmaline localities, internationally recognised for exceptional colour diversity. • Untreated Natural Material All colours, zoning and structural features are entirely natural and unenhanced. • Collector Quality Slice Its rare diffused blue architecture makes this a highly distinctive specimen among Brazilian tourmaline slices. COLLECTOR’S INTEREST: Tourmaline slices displaying naturally diffused colour architecture are considerably less common than specimens with sharply defined zoning. Rather than relying on abrupt colour separation, this crystal achieves its beauty through gradual transitions that create a far more organic and painterly appearance. The combination of a rich Royal Blue core, transparent bluish teal margins and excellent internal clarity gives the specimen a unique visual identity. Under transmitted light, the colours acquire additional depth, revealing subtle internal textures that enhance its mineralogical appeal. Its Minas Gerais provenance further reinforces its desirability, making it an excellent addition to collections focused on fine Brazilian tourmalines, natural colour zoning and aesthetically distinctive crystal slices. LAPIDARY POTENTIAL: Although the material displays attractive colour and good transparency, its greatest value lies in the preservation of its natural internal colour architecture. Any recutting would permanently remove the delicate diffused zoning that distinguishes this specimen from conventional tourmaline rough. For this reason, it is best appreciated in its present form as a natural collector slice, preserving both its exceptional chromatic composition and its geological integrity. ——————— 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 photos were taken under controlled light conditions, carefully selected to reproduce the most accurate natural color of each specimen. No filters, color enhancement, or artificial saturation were applied. The lighting setup is used exclusively to represent the piece as it appears under neutral daylight, ensuring that buyers can appreciate its true tones and luster without distortion. Identification and ethics: All specimens offered are guaranteed natural and as described. Their origin and mineral identification are provided with the most accurate and reliable information available. Every effort is made to ensure that each piece is presented with full transparency, avoiding any misleading details regarding its nature, treatment, or provenance. 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 a priority. 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