Extremely Rare Pleochroic Tanzanite Crystal GEMME Quality...

Exceptional natural rough tanzanite, 2.30 carats, from Tanzania and presented in its natural state, 100% natural and untreated. This selected piece stands out with its magnificent deep blue with blue-violet nuances, its transparency, and the multiple reflections created by its natural crystal architecture. Particularly interesting for the collector, it combines several of the most sought-after features in a rough tanzanite: beautiful natural color, pleochroism, absence of heat treatment, preserved morphology, and Tanzanian origin. Technical characteristics - Stone: Natural tanzanite – gem variety of zoisite - Weight: 2.30 carats - Dimensions: 8.1 × 7.1 × 4.0 mm - Origin: Tanzania - Color: Deep blue to blue-violet - Optical phenomenon: Pleochroism - State: Natural rough - Treatment: Untreated - Naturalness: 100% natural - Quality: Premium selection - Destination: Gemmological collection A remarkable natural architecture This tanzanite has an especially aesthetic morphology. Its volume presents a succession of crystal planes, growth reliefs, and reflective surfaces that give the specimen remarkable depth. Light penetrates transparent zones before being reflected by the different internal structures and natural surfaces. It results in a remarkable sequence of flashes, from light electric-blue tones to areas of much deeper, saturated blue. This architecture was not created by cutting: it belongs to the crystal itself and directly testifies to its natural formation. Characteristic pleochroism of tanzanite One of the most fascinating properties of tanzanite is its pleochroism. Depending on the crystal orientation and lighting, the perceived color evolves. On this piece, the hues transition notably from bright blue to deep blue, with slightly violet components depending on the viewing angle. This feature makes the specimen particularly lively: its appearance Never fully fixed and evolves when the stone is viewed under different light sources. On rough tanzanite, the phenomenon is even more interesting because the natural orientations of the crystal have been preserved. Untreated – a tanzanite preserved in its natural state A key point sets this piece apart: it has undergone no heat treatment. Heating is extremely common in the tanzanite market and generally serves to enhance blue and violet tones sought in jewelry. Here, the crystal is offered untreated, thus preserving its natural chromatic expression. The presence of an appealing blue coloration in this state is a major asset for collectors who prefer natural, untreated gemstones. So it’s not just a beautiful tanzanite: it is also a mineralogical testament to the gem before human intervention. A gem with an extraordinary history The history of tanzanite is exceptionally recent in the scale of gemology. Commercially discovered in the 1960s, this blue-violet zoisite variety was revealed in northern Tanzania, near Mount Kilimanjaro. It was later named “tanzanite” in reference to its country of origin. In just a few decades, it has become one of the most famous colored gemstones in the world. But behind its beauty lies an even more extraordinary feature: unlike many precious stones, gem tanzanite has an extremely limited geographic distribution, with major commercial deposits concentrated around Merelani, Tanzania. An exceptional geological rarity compared to diamond Tanzanite is often described as being up to about 1,000 times rarer than diamond in terms of geological distribution. This comparison, widely used to illustrate rarity, is not an official gemological classification nor a direct value comparison. It nevertheless highlights a fundamental difference. Diamonds are mined in many countries on several continents. Gem tanzanite, by contrast, depends on an extremely limited mining area in Tanzania. The quantities of beautiful crystals reaching the market are therefore directly tied to this single region. Production can vary greatly, and only a portion of the extracted material has the characteristics sought for collections and jewelry. Beautiful rough crystals, naturally blue and untreated, thus constitute a particularly interesting category. A true collectible piece With 2.30 carats and dimensions of 8.1 × 7.1 × 4.0 mm, this tanzanite has a very striking visual presence. Its irregular morphology, its transparent zones, its color contrasts, and its numerous natural structures give this piece a unique identity that a faceted stone could not reproduce. It represents an excellent choice for a collection dedicated to rare gems, African minerals, untreated stones, or natural optical phenomena. Collection and patrimonial interest The combination of characteristics this piece offers — Tanzanian origin, 2.30 carats, intense blue, pleochroism, rough state, and lack of heating — gives it genuine collection interest. The exceptional geographic concentration of tanzanite deposits also explains why this gem has long attracted the interest of certain collectors from a heritage perspective. As with any gemstone, future value evolution cannot be guaranteed, but natural, untreated specimens constitute a particularly interesting category to preserve. A magnificent untreated rough tanzanite, preserving the authenticity of its natural formation and offering a remarkable combination of color, light, pleochroism, and geological rarity. General Terms of Sale – MineralsOpals: At MineralsOpals, your satisfaction is a top priority. All orders are handled with the utmost care, from stone selection to final shipment. - Shipping & timelines: Shipped within 1 to 3 business days at most, typically the day after the order. Shipping Monday to Friday (excluding weekends and holidays). Each package is sent via La Poste with a tracking number provided. Careful packaging: each stone is individually protected, then placed in a secure rigid carton. - Guarantee & customer service: 100% of shipments are guaranteed: if there is a problem, we always find a solution. You purchase with complete confidence: full refund, replacement, or goodwill gesture in case of loss or proven issue. If you have questions, doubts, or a specific request, you can contact me at any time; I will gladly respond as soon as possible. Trust & commitment Each stone is photographed with care to reflect its natural beauty. You benefit from personalized follow-up. My goal: to offer you a reliable, humane, and transparent purchasing experience. Thank you for your support. Feel free to browse our no-reserve auctions to discover other exceptional products and follow us to stay informed about our new offers.

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