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Tutte le aste / Etnografia / Extremely Rare Pleochroic Tanzanite Crystal GEMME Quality...
Exceptional entirely natural, untreated raw Tanzanite from Tanzania. This collectible piece stands out for its superb deep blue color with blue-violet nuances, beautiful transparency, and remarkable crystallinity clearly visible through its many natural surfaces. Kept in its raw state, this tanzanite allows you to admire the gem as it formed in nature, before any cutting or alteration. Its lack of thermal treatment greatly enhances its appeal to collectors seeking natural, characterful tanzanites. Technical characteristics - Stone: Natural Tanzanite – gem zoisite variety - Weight: 3.20 carats - Dimensions: 8.4 × 7.0 × 6.3 mm - Origin: Tanzania - Color: Deep blue to blue-violet - Optical phenomenon: Pleochroism - State: Natural rough crystal - Treatment: Untreated - Naturalness: 100% natural - Destination: Collection / gemmological specimen A remarkable natural color The first quality of this specimen lies in its color. The stone exhibits a particularly bright and intense blue, accompanied by cooler or slightly purplish hues depending on its orientation and lighting. This variation is characteristic of tanzanite pleochroism, a phenomenon by which the crystal shows different colors when observed along different crystallographic axes. Under suitable light, the numerous natural surfaces of this piece reflect light with great intensity, creating a succession of zones of electric blue, lavender blue, and blue-violet. The transparency of certain areas also allows observing the depth of the crystal and its internal structure. Untreated – a highly sought-after feature One of the major assets of this tanzanite is its untreated state. A significant proportion of commercially sold tanzanites undergo thermal treatment to enhance the blue and violet tones cherished in jewelry. Specimens preserving a natural blue expression without such treatment occupy a special place in gemological collections. This stone thus retains the natural chromatic expression of its crystal, as well as growth characteristics that tell its geological history. The extraordinary story of tanzanite Tanzanite is one of the great gemological discoveries of the 20th century. Unveiled to the international market in the late 1960s, this blue-to-violet zoisite variety was named “tanzanite” after its country of origin. Its history is closely linked to the region at the foot of Mount Kilimanjaro in northern Tanzania. Unlike diamonds, whose deposits are distributed across many countries and continents, significant commercial deposits of tanzanite are associated with a very restricted geographic zone around Merelani. This extraordinary geological concentration makes tanzanite a truly unique gem. A geological rarity far surpassing diamond in distribution Tanzanite is sometimes described as about a thousand times rarer than diamond. This figure should be understood as a comparison of geological rarity and distribution, not as an official gemological scale or a direct value comparison. The underlying principle remains striking: diamonds are mined in many regions of the world, while gemstone tanzanite comes essentially from a tiny area in Tanzania. Mining production is therefore intrinsically limited by the extent of the deposit. Extraction varies over time, and the appearance of beautiful natural crystals on the market is neither regular nor guaranteed. This adds another dimension to specimens that combine beautiful color, transparency, appealing weight, and lack of heating. A 3.20 carat crystal with exceptional character With its 3.20 carats and generous dimensions of 8.4 × 7.0 × 6.3 mm, this tanzanite offers a remarkable presence for a raw specimen. Its natural morphology is particularly interesting: crystalline reliefs, growth surfaces, transparent zones, and reflective planes compose a complex architecture that continually changes as the stone is moved under light. Rather than exhibiting the uniformity of a gem cut by man, this piece preserves the personality of a crystal extracted directly from its geological environment. Collectible piece and patrimonial interest This tanzanite offers an especially attractive combination: 3.20 carats, Tanzanian origin, deep blue color, pleochroism, fine transparency, rough state, and lack of heating. It will naturally find its place in a collection dedicated to rare gemstones, Tanzanian minerals, or high-quality natural crystals. Tanzanite is also sought after by some collectors for heritage reasons due to the extremely restricted location of its deposits. As with any gemstone, no future appreciation or profitability can be guaranteed; its true strength lies above all in its geological rarity, beauty, and natural character. A superb opportunity to acquire an untampered 3.20 carat raw tanzanite, preserving its natural morphology and its magnificent blue expression — a true fragment of Tanzania’s exceptional geological history. 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: Ships within 1 to 3 business days at most, usually the day after the order. Shipped 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 box. - Warranty & customer service: 100% of shipments are guaranteed: in case of issue, we always find a solution. You buy with confidence: full refund, replacement, or courtesy gesture in case of loss or proven problem. If you have questions, doubts, or a specific request, you can contact me at any time, and I will respond gladly as soon as possible. Trust & commitment Each stone is photographed with care to reflect its natural beauty. You receive personalized follow-up. My goal: to offer you a reliable, human, and transparent buying experience. Thank you for your support. Feel free to check our no-reserve auctions to discover other exceptional products and follow us to stay informed about our new offers.
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