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      $1,500.00 USD
      Prezzo consigliato al pubblico $4,500.00

      0.72 CTS CERTIFIED ALEXANDRITE TANZANIA COLOURCHANGE TBM-793

      1170
      1

      SKU
      tbm-793
      Dimensioni (mm)
      6.220 x 4.930 x 3.320mm
      Peso (cts)
      0.720
      Certified Gemstones
      Treatment
      No Treatment
      Clarity
      SI
      Tipo
      Faceted
      Colori

      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
      Verificato
      815 feedback

      • virginiemillefiori
        virginiemillefiori
        Negativo

        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.

      • peketrain
        peketrain
        Positivo

        Very pleased with the specimen and transaction

      • scsamler
        scsamler
        Positivo

        This stone made me fall in love with Padparadsha sapphire. Truly wonderful!

      20%
      Codice coupon love
      Valido fino a
      28th Feb 2025

      Verifica

      Questo prodotto è stato verificato da Gemstone Sheriff e hanno riscontrato quanto segue:
      • Descrizione Preciso
      • Immagini accurate

      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.

      Ultimo aggiornamento 1 anno fa

      Dettagli di spedizione

      Spedizione:
      $30.00 14 giorni tramite Standard Shipping - Tracked
      Spedizioni da:
      Australia

      Opzioni di pagamento

      • stripe

      Panoramica

      Tipo di elenco : Standard
      Codice prodotto : 2239942
      Inizia : 11th February 2025 02:57 pm PST
      * Tutti i prezzi sono in USD