THE PREMIER MARKETPLACE FOR REAL GEMS
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      $140.00 USD
      Estimated RRP $500.00

      12.81 CTS ALEXANDRITE - SPECIMEN FROM TANZANIA [S-SAFE255]

      4499
      12

      SKU
      Dimensions (mm)
      12.000 x 10.000 x 4.000mm
      Weight (cts)
      12.810
      Type
      Specimen
      Colours

      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.

      Shipping provider Shipping to Australia Shipping to rest of world
      FedEx $12.00 / 3 days $39.00 / 10 days
      Australia
      FedEx is discounted to $12.00 on orders with 2 or more items
      Rest of the world
      FedEx is discounted to $39.00 on orders with 2 or more items
      Registered Shipping $9.00 / 7 days $16.00 / 21 days
      Australia
      Registered Shipping is discounted to $9.00 on orders with 2 or more items
      Rest of the world
      Registered Shipping is discounted to $16.00 on orders with 2 or more items

      sedagems
      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
      Verified
      19070 Feedback

      • rainer999
        rainer999
        Positive

        Very special item, rare. Thanks an Happy New Year from Germany.

      • rainer999
        rainer999
        Positive

        Beautiful stone, perfect packaging, fast shipment, recommendable seller.

      • rainer999
        rainer999
        Positive

        Incredible stone, never seen before. Thank you from Germany. Will order again Dr. Rainer (medical doctor from Duisburg/Germany)

      • rainer999
        rainer999
        Positive

        Nice stone, perfect packaging, fast shipping, recommendable.

      • rainer999
        rainer999
        Positive

        Beautiful small mini, thanks and a good and healthy 2025.

      10%
      Coupon code SEDADEALS
      Valid Until
      1st Feb 2025

      Audit

      The Gemstone Sheriff program allows our members to request an audit on any product, which is completed by an independent Gemologist who assesses the accuracy of the item description and pictures.

      Shipping Details

      Shipping:
      $16.00 21 days via Registered Shipping
      Ships from:
      Australia

      Payment Options

      • paypal
      • stripe
      This seller adds 10.00% tax to transactions in Australia.

      Overview

      Listing Type : Standard
      Product ID : 862250
      Starts : 19th December 2024 06:06 pm PST
      * All prices are in USD