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      $175.00 USD
      Prix ​​de vente conseillé estimé $600.00

      12.45 CTS ALEXANDRITE - SPECIMEN FROM TANZANIA [S-SAFE249]

      2731
      6

      UGS
      Dimensions (mm)
      10.000 x 7.000 x 6.000mm
      Poids (cts)
      12.450
      Taper
      Specimen
      Couleurs

      ALEXANDRITE SPECIMEN

       

      This is a natural untreated Alexandrite specimen  from Tanzania which i bought from the miner on my last trip there. They are not suitable for faceting but can be cabbed or kept as a specimen.

       

      The most sensational feature about this stone, however, is its surprising ability to change its colour. Green or bluish-green in daylight, alexandrite turns a soft shade of red, purplish-red or raspberry red in incandescent light. This unique optical characteristic makes it one of the most valuable gemstones of all, especially in fine qualities.

       

      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.

       

      Like many other gemstones, alexandrite emerged millions of years ago in a metamorphic environment. But unlike many others, its formation required specific geological conditions. The chemical elements beryllium (a major constituent in chrysoberyl) and chromium (the colouring agent in alexandrite) have contrasting chemical characteristics and do not as a rule occur together, usually being found in contrasting rock types. Not only has Nature brought these contrasting rock types into contact with each other, but a lack of the chemical element silica (the second most common element in the Earth’s crust) is also required to prevent the growth of emerald. This geological scenario has occurred only rarely in the Earth’s history and, as a result, alexandrite crystals are very scarce indeed.

      Fournisseur d'expédition Expédition vers Australia Expédition dans le reste du monde
      FedEx $12.00 / 3 $39.00 / 10
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      FedEx bénéficie d'une remise de $12.00 sur les commandes contenant 2 ou plus d'articles
      Reste du monde
      FedEx bénéficie d'une remise de $39.00 sur les commandes contenant 2 ou plus d'articles
      Registered Shipping $9.00 / 7 $16.00 / 21
      Australia
      Registered Shipping bénéficie d'une remise de $9.00 sur les commandes contenant 2 ou plus d'articles
      Reste du monde
      Registered Shipping bénéficie d'une remise de $16.00 sur les commandes contenant 2 ou plus d'articles

      sedagems
      Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
      Mermaid Waters , Australia
      Vérifié
      19220

      • rickferreira626
        rickferreira626
        Positif

        A gorgeous pair blue topaz stones. This is one happy customer.

      • opalgoat
        opalgoat
        Positif

        Well packaged, beautiful gems

      • opalgoat
        opalgoat
        Positif

        Well packaged, beautiful gems

      • opalgoat
        opalgoat
        Positif

        Well packaged, beautiful gems

      • opalgoat
        opalgoat
        Positif

        Well packaged, beautiful gems

      5%
      Code promo SEDADEALS
      Valable jusque
      4th Mar 2025

      Audit

      Le programme Gemstone Sheriff permet à nos membres de demander un audit sur tout produit, qui est complété par un Gemologist indépendant qui évalue l'exactitude de la description de l'article et des photos.

      Les détails d'expédition

      Expédition:
      $16.00 21 les jours via Registered Shipping
      Expédié depuis:
      Australia

      Options de paiement

      • paypal
      • stripe
      Ce vendeur ajoute 10.00% aux transactions en Australia .

      Aperçu

      Type d'inscription : Standard
      Identifiant du produit : 1723148
      Départs : 13th February 2025 07:06 pm PST
      * Tous les prix sont en USD