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      $44.00 USD
      価格

      28.22 CTS DRILLED RUBY ROUGH MADAGASCAR -TREATED [MGW8128]

      2198
      1

      SKU
      寸法(mm)
      27.000 x 15.000 x 8.000mm
      重さ (CT)
      28.220
      タイプ
      Rough

       

       

      RUBY ROUGH  DRILLED 
      Rough drilled and ready to be strung.  1.5 mm hole.

       

       

      Birthstone for  July

       

      This is rough Ruby  from Madagascar which has been  treated  and  showing stunning colors.


      This is a piece of rough mined in Madagascar-africa. The material has been heated to improve its colour and it has also been treated by lead glass filling.

       



       

       

      A Ruby is a pink to blood-red gemstone  a variety of the mineral corundum (aluminium oxide]. The common red color is caused mainly by the presence of the element chromium. Its name comes from ruber, Latin for red. Other varieties of gem-quality corundum are called sapphires. Prices of rubies are primarily determined by color. The brightest and best "red" called pigeon blood-red, commands a huge premium over other rubies of similar quality. After color follows clarity: similar to diamonds, a clear stone will command a premium, but a ruby without any needle-like rutile inclusions will indicate that the stone has been treated one way or another. Cut and carat (size) also determine the price

       

      TREATMENTS

       

      The most common treatment is the application of heat. Most if not all rubies at the lower end of the market are heat treated on the rough stones to improve color, remove purple tinge, blue patches and silk. These heat treatments typically occur around temperatures of 1800°C (3300°F).Some rubies undergo a process of low tube heat, when the stone is heated over charcoal of a temperature of about 1300°C (2400°F) for 20 to 30 minutes. The silk is only partially broken as the color is improved.

      LEAD GLASS TREATMENT 

      Filling the fractures inside the ruby with lead glass dramatically improves the transparency of the stone, making previously unsuitable rubies fit for applications in jewelry. The process is done in four steps:

      1. The rough stones are pre-polished to eradicate all surface impurities that may affect the process
      2. The rough is cleaned with hydrogen fluoride
      3. The first heating process during which no fillers are added. The heating process eradicates impurities inside the fractures. Although this can be done at temperatures up to 1400°C (2500°F) it most likely occurs at a temperature of around 900°C (1600°F) since the rutile silk is still intact
      4. The second heating process in an electrical oven with different chemical additives. Different solutions and mixes have shown to be successful, however mostly lead-containing glass-powder is used at present. The ruby is dipped into oils, then covered with powder, embedded on a tile and placed in the oven where it is heated at around 900°C (1600°F) for one hour in an oxidizing atmosphere. The orange colored powder transforms upon heating into a transparent to yellow-colored paste, which fills all fractures. After cooling the color of the paste is fully transparent, that dramatically improves the overall transparency of the ruby.

       

      配送業者 配送先Australia その他の国への配送
      FedEx $12.00 / 3 $39.00 / 10
      :国
      FedEx 、 2以上のアイテムを含む注文で$12.00に割引されます
      世界のその他の地域
      FedEx 、 2以上のアイテムを含む注文で$39.00に割引されます
      Registered Shipping $9.00 / 7 $16.00 / 21
      :国
      Registered Shipping 、 2以上のアイテムを含む注文で$9.00に割引されます
      世界のその他の地域
      Registered Shipping 、 2以上のアイテムを含む注文で$16.00に割引されます

      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
      確認済み
      19214フィードバック

      • opalgoat
        opalgoat
        ポジティブ

        Well packaged, beautiful gems

      • opalgoat
        opalgoat
        ポジティブ

        Well packaged, beautiful gems

      • opalgoat
        opalgoat
        ポジティブ

        Well packaged, beautiful gems

      • opalgoat
        opalgoat
        ポジティブ

        Well packaged, beautiful gems

      • opalgoat
        opalgoat
        ポジティブ

        Well packaged, beautiful gems

      5%
      クーポンコード SEDADEALS
      まで有効
      4th Mar 2025

      監査

      Gemstone Sheriffプログラムでは、メンバーがあらゆる製品の監査をリクエストできます。監査は独立したGemologistによって完了され、アイテムの説明と写真の正確さが評価されます。

      発送詳細

      配送:
      $16.00 21日 ( Registered Shipping経由)
      発送元:
      Australia

      支払いオプション

      • paypal
      • stripe
      この販売者は、 Australiaでの取引に10.00%税金を追加します。

      概要

      リストタイプ : Standard
      製品番号 : 1380269
      始まります : 12th February 2025 06:27 pm PST
      * すべての価格はUSDで表記されています

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