Australian Facetors' Guild Limited

How to heat natural Zirkons on the kitchen stove?

  • 27 Jan 2018 5:56 AM
    Message # 5703737

    I´ve heard that you could heat natural brown zirkons on the kitchen stove. Is that true? How do you heat them? In the frying pan? What´s positive about it and negative? Have a nice day!:) Regards Alexandra

  • 28 Jan 2018 5:25 PM
    Reply # 5705451 on 5703737

    Place the brown or red zircons on a jewellers soldering block. I use a jewellers butane soldering torch. Heat the stones for a few seconds with the torch and the stones go white almost instantly. I faceted one and it had lots of sparkle 

    Last modified: 28 Jan 2018 5:27 PM | Anonymous member
  • 30 Jan 2018 7:12 AM
    Reply # 5707871 on 5703737

    Thank you so much for your answer! I´ll try it out. Have  a nice day!:)

    Regards Alexandra

  • 30 Jan 2018 5:59 PM
    Reply # 5708628 on 5703737

    Hi Bob.  

    When you heat the zircons, do you bring in the torch gradually like when drying flux before soldering them, or simply blast them with heat?

    I would have thought the latter would result in thermal shock and increased internal stress.


    Regards Gordon Perkins 

    Last modified: 01 Mar 2018 7:35 AM | Anonymous member
  • 28 Feb 2018 11:39 AM
    Reply # 5880802 on 5703737

    It would probably be safer to bring the flame to the soldering block and warm it a bit then focus the heat on the zircons. The few I have done have not been a problem(so far). If they are badly included take a bit more care. Try it on some old stones that are  included. Experiment a few different ways.

    Nothing ventured nothing gained.

  • 01 Mar 2018 7:34 AM
    Reply # 5882673 on 5703737

    Thanks Bob.

    I have some which are cracked to try it on.  There are a couple of small stones each side of the crack.

    Do you think this method would encourage the stone to split in two?

    Regards

    Gordon Perkins 

  • 07 Apr 2018 12:10 PM
    Reply # 6051431 on 5703737

    Gordon I haven't found that to be a problem as yet, but I haven't done a real lot of stones. Once you experiment you will find out for your self. If the stones have a fracture in them it is probably best to cut them through the fracture anyway. Because you know what is going to happen you will be almost finished faceting the stone and half of it disappears into the bowl of your faceting machine.

    Regards

    Bob Boddington 

  • 08 Apr 2018 10:46 PM
    Reply # 6052641 on 5703737

    Thanks Bob


  • 13 Jun 2018 7:50 AM
    Reply # 6307483 on 5703737

    Thanks Bob.  I tried heating some ceacked rough on the weekend.  

    A couple popped but the rest were intact even after heating to an orange glow on the outside.  

    The orange glow couple had a dark staining on a cracked face that just went a bit darker on heating.

    It also made it easier to separate the cuttable pieces from the flaws.

    I'm a bit more confident about having a go with better quality zircon

    Regards

    Gordon 

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