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      $1,500.00 USD
      Prix ​​de vente conseillé estimé $4,500.00

      0.72 CTS CERTIFIED ALEXANDRITE TANZANIA COLOURCHANGE TBM-793

      1183
      1

      UGS
      tbm-793
      Dimensions (mm)
      6.220 x 4.930 x 3.320mm
      Poids (cts)
      0.720
      Certified Gemstones
      Oui
      Treatment
      No Treatment
      Clarity
      SI
      Taper
      Faceted
      Couleurs

      ALEXANDERITE

      BI-COLOUR

      TANZANIA-MANGHOLA DUMAWANGA DISTRICT ARUSHA REGION

      NICE GREEN CHANGES TO PURPLE

      IDEAL FOR CABBING

      TREATMENT-NONE

      This rare gemstone is named after the Russian tsar Alexander II (1818-1881), the very first crystals having been discovered in April 1834 in the emerald mines near the River in the Urals. The discovery was made on the day the future tsar came of age. Although alexandrite is a relatively young gemstone, it certainly has a noble history. Since it shows both red and green, the principal colours of old Imperial Russia, it inevitably became the national stone of tsarist Russia.

      Alexandrite is very scarce: this is due to its chemical composition. It is basically a chrysoberyl, a mineral consisting of colourless or yellow transparent chrysoberyl, chrysoberyl cat’s eye and colour-changing alexandrite (also in cat’s eye varieties). It differs from other chrysoberyls in that it not only contains iron and titanium, but also chromium as a major impurity. And it is this very element which accounts for the spectacular colour change. Rarely, vanadium may also play a part. According to CIBJO nomenclature, only chrysoberyls displaying a distinct change of colour may be termed alexandrite.

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      trueblueminerals
      trueblueminerals
      rare large gemstones and minerals
      Mermaid Beach , Australia
      Vérifié
      817

      • virginiemillefiori
        virginiemillefiori
        Négatif

        unfortunately the colors in person under artificial or natural light look nothing like the ones posted on the listing. The stone appears very dark blue and it is hard to guess it is a parti sapphire.

      • guest354302
        guest354302
        Positif

        Paid and shipped - no feedback left after 100 days

      10%
      Code promo vip discount
      Valable jusque
      1st Apr 2025

      Audit

      Ce produit a été audité par un Gemstone Sheriff et ils ont trouvé les éléments suivants :
      • Description Précis
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      Comments

      The Verified Seller responsible for this item has diligently provided us with accurate and comprehensive information, encompassing crucial details such as weight, dimensions, and treatment. It is important to reiterate our commitment to upholding the highest standards of integrity and transparency in the gemstone industry. As part of our policy, we strictly permit the sale of exclusively natural gemstones that have been sourced directly from the Earth. However, in the event that a gemstone has undergone any form of treatment, it is mandatory for the seller to provide full disclosure regarding the treatment process. Furthermore, we would like to emphasize that man-made gemstones, including simulants and imitations, are strictly prohibited on our platform. We prioritize the promotion of authentic, natural gemstones to ensure a genuine and trustworthy marketplace for our valued customers. Should you have any further inquiries or require additional assistance, please do not hesitate to reach out. We are here to assist you and provide a seamless experience on Gem Rock Auctions.

      Dernière mise à jour il y a 1 an

      Les détails d'expédition

      Expédition:
      $30.00 14 les jours via Standard Shipping - Tracked
      Expédié depuis:
      Australia

      Options de paiement

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      Aperçu

      Type d'inscription : Standard
      Identifiant du produit : 2239942
      Départs : 25th February 2025 02:57 pm PST
      * Tous les prix sont en USD