Gold, Diamond and glass oddity

Discussion in 'Jewelry' started by KSW, Mar 9, 2020.

  1. KSW

    KSW Well-Known Member

    This was in my latest joblot.
    Any ideas as to how it started life or what it was?.
    Plain black glass plaque with square of gold and a central diamond.
    Diamond has a porthole behind it to let light through but it’s currently full of dirt. Confident it’s diamond as both gem testers say it is. Mary Contrary is rubbish with semi precious but spot on with diamonds. Diamond appears square although there’s a lot of dirt with a flat table on the top. Missing something that was attached with the other holes.
    The black glass is about 18mm long,12mm wide and 2.5mm thick.
    The gold square is c2.5mm sq and the diamond in the centre is 1mm square. Any thoughts as to what it is (or what I could use it for!?)
    Sorry it’s the devil to photograph!
    Thanks for looking :)

    E4668791-5B75-4187-BA39-D6B7B0976F52.jpeg 35BD6A3F-6804-4C0D-9929-795BB121265A.jpeg 8F52EB87-0C6A-4A66-977D-3C8F4608928D.jpeg DD68B32E-B7A2-4E02-8FC1-9B0EC98AA3EC.jpeg A621638B-028B-45D6-9B08-46745484B57B.jpeg 0926EAE9-2C74-40C2-AA4F-715F9C5AA952.jpeg
     
    KSW, Mar 9, 2020
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    kyratango likes this.
  2. DragonflyWink

    DragonflyWink Well-Known Member

    Looks to me like a black onyx from a man's signet ring with the gold initial removed...

    ~Cheryl
     
    DragonflyWink, Mar 9, 2020
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    kyratango, patd8643, stracci and 2 others like this.
  3. DragonflyWink

    DragonflyWink Well-Known Member

    DragonflyWink, Mar 9, 2020
    #3 + Quote Reply
    Any Jewelry, kyratango, patd8643 and 2 others like this.
  4. Hollyblue

    Hollyblue Well-Known Member

    The "porthole" is for cleaning the back of the stone and nothing to due with light.
     
    Hollyblue, Mar 9, 2020
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    Any Jewelry and KSW like this.
  5. KSW

    KSW Well-Known Member

    KSW, Mar 9, 2020
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    kyratango likes this.
  6. KSW

    KSW Well-Known Member

    KSW, Mar 9, 2020
    #6 + Quote Reply
  7. Hollyblue

    Hollyblue Well-Known Member

    Impossible to date,the style was probably sold for at least 60 years. Replacement onyx stones were still being sold in 2000.
     
    Hollyblue, Mar 9, 2020
    #7 + Quote Reply
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