Description: If one could observe the Earth recording its own chemical fluctuations in real time, this slice would be the result. Rather than a simple colour transition, this Watermelon Tourmaline presents a highly structured and rhythmic sequence of concentric zoning, where each layer reflects a distinct moment in the crystal’s growth history. At first glance, the outer boundary appears as a deep petrol green rim, dense and visually anchoring the entire structure. Moving inward, this gives way to a vivid, highly saturated green layer, bright and energetic, immediately followed by a darker green blue band that introduces a cooler, more subdued tonal shift. What makes this specimen exceptional is the repetition and oscillation of these chromatic states. The sequence does not evolve linearly but alternates, returning again to a vivid green layer before transitioning once more into a green blue zone with increasing depth and saturation. This cyclical zoning suggests repeated fluctuations in trace element availability during crystallisation, most likely linked to variations in iron and manganese concentration within the pegmatitic environment. As the structure progresses toward the centre, the green blue tones intensify briefly before softening into a lighter transitional zone. This gradual release of chromatic density culminates in a pale, almost aqueous core, where the colour becomes minimal and the crystal reveals its internal clarity. This central area acts as a visual and compositional point of rest, enhancing the contrast with the surrounding layers. The zoning is not only visually striking but also sharply defined, with each band remaining clearly distinguishable from the next. There is no diffusion or blurring between layers, reinforcing the sense of discrete growth stages rather than a continuous gradient. Under transmitted light, the entire structure becomes dramatically more expressive. The outer green zones deepen, while the inner regions illuminate, revealing subtle internal textures and growth features. This interaction with light enhances both the perceived depth and the readability of the zoning sequence, transforming the slice into a dynamic optical object. The piece retains natural lateral textures from the original crystal, including fine longitudinal striations that confirm its prismatic origin. Minor internal inclusions are present, consistent with natural formation, and contribute to the geological authenticity of the specimen. Rather than being defined by a single colour, this tourmaline is defined by its structure. It is a precise and layered record of changing conditions, preserved with exceptional clarity and visual coherence. Specifications: • Weight: 0.20 g • Weight in carats: 1.00 ct • Dimensions: 7 x 6 x 2 mm • Origin: Minas Gerais, Brazil • Mineral species: Tourmaline • Variety: Watermelon Tourmaline • Crystal system: Trigonal • Form: Natural crystal slice • Colour zoning: Concentric multi stage zoning • Colour sequence: Petrol green, vivid green, green blue, repeating green and green blue bands, pale central zone • Transparency: Translucent to locally transparent • Lustre: Vitreous • Treatment: None • Condition: Natural, intact slice Notable Points: • Complex multi layer concentric zoning with clear separation between bands • Alternating chromatic sequence rather than simple radial gradient • Deep petrol green outer rim providing strong visual framing • Repetition of vivid green and green blue layers indicating fluctuating growth conditions • Increasing chromatic density toward intermediate zones • Pale central core enhancing contrast and depth perception • High readability of individual layers with minimal diffusion • Strong response under transmitted light, enhancing zoning visibility • Natural internal inclusions consistent with unaltered formation • Preserved lateral striations confirming original crystal habit • Balanced slice with strong visual symmetry • Minas Gerais origin, classic locality for complex tourmaline zoning Collector’s Interest: This specimen stands out not for a single dominant colour, but for the precision and repetition of its zoning structure. Multi layered tourmalines displaying clear oscillation between chromatic states are significantly less common than simple bi colour or tri colour examples. Its value lies in the clarity with which each growth phase is recorded. The alternating sequence creates a visual rhythm that is both aesthetically compelling and mineralogically informative, making it particularly appealing to collectors focused on crystal growth phenomena. Lapidary Potential: Any attempt at cutting would eliminate the defining feature of this specimen, its concentric zoning sequence. The value of the piece lies entirely in its preservation as a natural slice, where the full structural evolution remains visible and 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 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. Our goal is to continuously bring you some of the most beautiful, unique, and exceptional mineral specimens from around the world. Each piece is carefully selected for its quality and character, ensuring that every purchase meets the highest standards. Your satisfaction and confidence are our top priorities, and we will always strive to exceed your expectations with every order. With gratitude, GemPulse Minerals