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      $175.00 USD
      預計建議零售價:rrp

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

      2732
      6

      存貨單位
      尺寸(毫米)
      10.000 x 7.000 x 6.000mm
      重量 (cts)
      12.450
      類型
      Specimen
      顏色

      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.

      運輸商 運送至:國家 運送到世界其他地區
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      :國家
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      Registered Shipping $9.00 / :幾天天 $16.00 / :幾天天
      :國家
      Registered Shipping訂單折扣為$9.00 2或更多商品
      世界其他地區
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      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.
      :城市,國家
      已驗證
      :總反饋

      • rickferreira626
        rickferreira626
        積極的

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

      • opalgoat
        opalgoat
        積極的

        Well packaged, beautiful gems

      • opalgoat
        opalgoat
        積極的

        Well packaged, beautiful gems

      • opalgoat
        opalgoat
        積極的

        Well packaged, beautiful gems

      • opalgoat
        opalgoat
        積極的

        Well packaged, beautiful gems

      5%
      優惠券代碼 SEDADEALS
      有效期至
      4th Mar 2025

      審計

      Gemstone Sheriff計畫允許我們的會員要求對任何產品進行審核,該審核由獨立的Gemologist人員完成,該資格人員評估商品描述和圖片的準確性。

      送貨細節

      船運:
      $16.00 21透過Registered Shipping計算天數
      發貨自:
      Australia

      付款方式

      • paypal
      • stripe
      該賣家在Australia交易中加入了10.00%稅。

      概述

      列表類型 : Standard
      產品編號 : 1723148
      開始 : 13th February 2025 07:06 pm PST
      * 所有價格均以:貨幣為單位