**Layered Chromatic Architecture** This specimen presents a rare and highly articulated five stage concentric zoning, each layer distinctly preserved and optically legible from the outer boundary towards the core. From the exterior inward, the structure unfolds as follows: • Outer rim: a fine cyan blue boundary layer, translucent and delicately diffused, forming the first optical interface with light • Primary outer zone: a saturated emerald green band, rich and vibrant, with subtle internal tonal variation and depth • Transitional green zone: a darker, cooler green with petrol undertones, acting as a natural chromatic compression between outer and inner domains • Inner ring: a sharply defined electric blue band, highly luminous and uniform, creating a precise separation of structural phases • Core: a deep indigo blue nucleus, dense and optically absorptive, anchoring the entire composition This level of clarity and separation between five distinct chromatic layers is exceptionally uncommon within tourmaline slices, particularly at this scale. ————— Description: This Watermelon Tourmaline slice is distinguished by an exceptionally rare multi layered chromatic structure, where five clearly defined concentric zones coexist within a compact and fully preserved crystal section. Such a degree of organisation, contrast and optical readability is seldom encountered, especially in specimens of this size. At its outer boundary, a fine cyan blue rim introduces the structure with a soft yet distinct optical transition. This layer is immediately followed by a saturated emerald green zone, which dominates the outer body of the slice with vivid intensity and internal texture. The green is not flat but alive, displaying subtle tonal variations that enhance its volumetric presence. Moving inward, the colour compresses into a darker green transitional band with cooler, slightly petrol like undertones. This zone acts as a natural bridge between the outer chromatic field and the inner optical core, creating depth and reinforcing the concentric architecture. The most striking transition occurs at the electric blue inner ring. This band is sharply defined, highly luminous and remarkably clean, forming a precise and visually powerful boundary. Its intensity contrasts strongly with both the surrounding greens and the central core, acting as a focal transition point within the structure. At the centre, a deep indigo blue core anchors the entire specimen. This nucleus is more optically dense, absorbing light rather than transmitting it, which creates a strong visual contrast with the surrounding luminous zones. The result is a composition that feels both structured and dynamic, with each layer playing a distinct optical role. The slice retains its natural geometry, with a slightly irregular yet harmonious outline that reflects its original crystal growth. Fine surface features and internal textures are visible under magnification, confirming its natural origin and unaltered state. Material from Minas Gerais is globally recognised for producing high quality tourmaline, yet specimens displaying five clearly separated chromatic layers with this level of definition and contrast remain distinctly rare. This is not simply a colour zoned slice. It is a highly organised chromatic system, preserved with precision, balance and exceptional visual clarity. Specifications: • Weight: 0.31 g • Weight in carats: 1.55 ct • Dimensions: 8 x 6.5 x 3 mm • Origin: Minas Gerais, Brazil • Mineral species: Tourmaline • Variety: Watermelon Tourmaline • Crystal system: Trigonal • Form: Natural crystal slice • Core structure: Deep indigo blue central core • Colour zoning: Five stage concentric zoning • Colour sequence: Cyan blue rim, emerald green zone, darker green transitional band, electric blue ring, indigo blue core • Transparency: Translucent to locally opaque in core • Lustre: Vitreous • Surface features: Natural growth textures and minor inclusions • Treatment: None • Condition: Natural, intact slice Notable Points: • Exceptionally rare five layer chromatic zoning Clearly defined and visually separable concentric layers, uncommon in tourmaline slices of this size • Strong emerald green outer zone with internal depth A vibrant and textured green band that provides the primary visual mass of the specimen • Distinct darker green transitional compression zone A subtle yet critical layer that enhances depth and reinforces structural readability • High definition electric blue inner ring A sharply delineated and luminous band that creates strong contrast within the composition • Deep indigo blue core with optical density A visually anchoring centre that absorbs light and enhances overall contrast • Fine cyan blue outer rim A delicate boundary layer introducing the structure with a refined optical transition • Excellent contrast between all chromatic layers Each zone remains clearly legible without blending, enhancing visual clarity • Natural and unaltered specimen No cutting or enhancement beyond slicing, preserving original growth structure • Balanced proportions and compact form Despite its small size, the piece maintains strong visual presence and symmetry • Minas Gerais provenance A classic and highly respected locality for quality tourmaline material • High photogenic performance Responds exceptionally well to controlled lighting, enhancing colour separation • Museum grade zoning clarity at small scale The level of definition and organisation elevates the specimen beyond typical material Collector’s Interest: Tourmaline slices displaying clear concentric zoning are widely appreciated, yet specimens exhibiting five distinct and optically separable layers remain rare. What distinguishes this piece is not only the number of layers, but the precision with which each one is expressed. The strong contrast between green and blue tonal families, combined with the sharp definition of the electric blue ring and the depth of the indigo core, creates a composition that is both visually striking and mineralogically significant. Its compact size further enhances its appeal, as such complexity is rarely preserved at this scale. This makes it particularly desirable for collectors seeking highly expressive yet refined specimens. Lapidary Potential: Any attempt at cutting or reshaping would irreversibly destroy the delicate concentric zoning and the precise balance between layers. The value of this specimen lies entirely in its preservation as a natural crystal slice, where its full structural and chromatic architecture remains intact. It is best appreciated as a collector piece or as a display specimen where its layered composition can be fully observed. ——————— 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. In the event of any issue, such as loss, damage, or discrepancy, please contact us immediately through Catawiki’s messaging system. We will always find a fair and suitable solution, including refund, replacement, or other commercial arrangements whenever justified. Appreciation and commitment: We sincerely thank you for your trust and preference. 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