Rare Natural Bicolour Tanzanite with EXCEPTIONAL Zoning • 3.95 carats - Height: 10 mm - Width: 9 mm- 0.78 g - (1)

Description:
From the metamorphic slopes that embrace the foothills of Mount Meru, where layers of graphite and blue toned schists forged over millions of years the single geological cradle from which all tanzanite originates, comes this raw 3.95 carat crystal whose presence captivates from the very first moment. Its surface reveals small growth scars that bear witness to the slow and profound metamorphic processes responsible for shaping one of the most revered gemstones on the planet. Yet within this specimen we find something even rarer: a clear and naturally formed bicolour expression, where crystalline blue meets deeper violet in transitions that are both soft and unmistakably defined, creating colour zones that only appear when aluminium, vanadium and the fluctuating pressures of metamorphism align in a way seldom achieved within this mineral. This chromatic division, visible and distinctive, transforms the piece into a singular example valued by collectors and enthusiasts who recognise in it an authentic geological record of Tanzanian formation.

The body of the gem displays luminous translucence that allows the interior to glow subtly, while the violet zone, more saturated and expressive, creates depth and contrast. It is a piece that comes alive under light from any angle and, despite its compact size, concentrates within itself the beauty of natural zoning and the uniqueness of a tanzanite that is never repeated.

Specifications:
• Weight: 0.79 g
• Carat weight: 3.95 ct
• Dimensions: 10 × 9 × 7 mm
• Origin: Merelani Hills - Block D, Lelatema Mountains, Arusha Region, Tanzania
• Colour: Natural bicolour blue and violet
• Zoning: Clear two tone colour transition
• Transparency: Translucent
• Formation marks: Natural growth textures visible
• Clarity type: Typical metamorphic inclusions
• Crystal form: Natural raw fragment

Collector’s Interest:
This bicolour tanzanite offers immediate appeal to collectors seeking pieces with their own geological signature. The visible zoning is a highly desired phenomenon, especially when well defined chromatic contrasts appear in a crystal of this size. It is an example that distinguishes itself from more common tanzanites and easily becomes a central piece in any collection focused on African metamorphic minerals.

Lapidary Potential:
Although primarily a collector’s specimen, the piece presents potential for an artistic cabochon or a freeform cut that preserves the dual colour character. Experienced lapidaries may choose to emphasise either the luminous blue region or the deeper violet core, depending on the creative direction, conserving the zoning that defines the stone’s identity.

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Photography and transparency:
All photos were taken under controlled light conditions, carefully selected to reproduce the most accurate natural colour of each specimen. No filters, colour enhancement, or artificial saturation were applied. The lighting setup uses a calibrated 5500K light source, which replicates neutral daylight and reveals the true tones and clarity of the mineral. Under weaker or more yellow indoor lighting, colours may appear slightly different, which is normal and expected. The purpose of this setup is to present each specimen exactly as it appears in balanced natural daylight, allowing buyers to appreciate its authentic colour and lustre 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.

Shipping and handling:
Orders are carefully prepared, with each stone individually protected and placed in a secure rigid box to ensure safe delivery. Shipments are made within 1 to 3 business days after payment confirmation, always with a tracking number provided to the buyer. Each order is handled with professional care from selection to dispatch, ensuring a smooth and trustworthy process.

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