**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: At first glance, the defining feature of this tanzanite is the extraordinary discipline of its crystal habit. Vertical prismatic faces rise from the base with striking precision, forming a rigid, architectural structure where each plane stands upright like a column carved by geological intent. The crystal presents itself contained, aligned and visually complete, immediately conveying a sense of order and strength. These perfectly developed crystal faces act as natural conduits for light. Illumination travels cleanly along the length of the prism, igniting internal reflections that shift dramatically with changing light conditions. Under softer lighting, the crystal expresses refined lilac and violet tones, calm and elegant. When exposed to direct light, the colour deepens into saturated blue hues, revealing the classic pleochroic behaviour that defines high quality tanzanite. The geometry of the crystal is its greatest asset. The prismatic structure remains coherent and uninterrupted, giving the specimen a solid vertical presence that feels deliberate rather than accidental. Light interacts with the parallel growth lines, producing a subtle rhythm of reflections that enhances depth and dimensionality. Internal features are natural and consistent with primary growth, contributing texture and authenticity without overwhelming the body. Rather than detracting, these features give the crystal a living interior, reinforcing its geological origin and untreated state. Despite its modest size, this tanzanite carries disproportionate visual authority. It is a piece that commands attention not through excess, but through precision. Precision of growth, precision of form, and precision in the way colour and structure respond to light. A refined mineral specimen shaped entirely by time, pressure and chemistry. Specifications: • Weight: 0.86 g • Weight in carats: 4.30 ct • Dimensions: 16 x 6 x 5 mm • Origin: Merelani Hills, Tanzania • Mineral: Zoisite • Variety: Tanzanite • Crystal habit: Prismatic crystal with strong vertical development • Colour: Violet to deep blue • Optical behaviour: Natural colour shift depending on light source • Transparency: Translucent to locally transparent • Lustre: Vitreous • Condition: Natural, unpolished, untreated Notable Points: • Strong prismatic crystal habit with disciplined vertical development • Upright, architectural geometry giving a contained and balanced appearance • Well defined crystal faces with clean parallel growth lines • Natural pleochroic colour shift visible under different lighting conditions • Violet tones under soft light transitioning to deep blue under direct light • Excellent light interaction along the length of the crystal • Internal growth features consistent with primary formation • High visual coherence despite compact dimensions • Untreated and unpolished state preserving full geological authenticity • Clear structural integrity without distortion of form • Classic Merelani Hills origin, Tanzania • Strong specimen presence beyond its physical size • Refined balance between structure and colour • Visually complete prismatic body • Suitable for both advanced collectors and high level lapidary consideration Collector’s Interest: Tanzanite specimens displaying such disciplined prismatic growth combined with clear pleochroic behaviour are increasingly difficult to source. This example stands out for its structural coherence and strong optical response, offering collectors a piece defined by precision rather than scale. Its contained geometry, authentic colour behaviour and untreated state position it as a serious addition to advanced mineral or gem focused collections. ⸻ Lapidary Potential From a lapidary perspective, this crystal presents genuine potential. The colour depth, pleochroic behaviour and structural integrity could translate into a small but exceptionally expressive gemstone. Any cutting should be approached with respect for the crystal’s natural form, as its current specimen value lies strongly in its intact structure and visual authority. —————— Shipping and Handling: All orders are shipped by Portuguese National Post. • Dispatch time: within 1 to 3 business days after payment confirmation to Catawiki • Transit time with CTT service: between 5 to 7 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