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Nail Head vs. Fish Eye????

Discussion in 'RockyTalky' started by curious, Jan 15, 2002.

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  1. curious
    Rough_Rock

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    by curious » Jan 15, 2002
    Please clafify a NAIL HEAD EFFECT and a FISH EYE EFFECT.

    I have thoroughly read the tutorial and am still confused.

    If possible, can you show some pictures of diamonds with these effects.

    Muchas Gracias!!!

    :wavey:
     
    


    


  2. pricescope
    Ideal_Rock

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    by pricescope » Jan 15, 2002
    Hi Curious, :)

    Fisheye: reflection of the girdle is visible under the table in the face-up position. It happens when diamond has shallow pavilion and large table:

    Nailhead: table of the diamond appears very dark. This happens when pavilion is too deep.

    [​IMG] [​IMG]




    [/u][/u]
     
  3. Garry H (Cut Nut)
    Super_Ideal_Rock
    Trade

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    by Garry H (Cut Nut) » Jan 15, 2002
    My diamond cut nerd work has been done so well by the computer nerd :appl:
     
  4. curious
    Rough_Rock

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    by curious » Jan 16, 2002
    Thanks for the great pics...they helped a lot.

    Why do round stones seem to have a black dot in the middle where all the facets come together? Is this a natural effect?

    :twirl:
     
    


    


  5. curious
    Rough_Rock

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    by curious » Jan 21, 2002
    How deep of a pavilion will cause the nail-head effect????
     
  6. pricescope
    Ideal_Rock

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    by pricescope » Jan 21, 2002
    You can find the chart here:


    [/u]
     
  7. Garry H (Cut Nut)
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    by Garry H (Cut Nut) » Jan 21, 2002
    It also depends on the size of your head (he he he).
    Actually it does, because the rays perpendicular to the table in a diamond with a 45 degree pavilion angle go right back to where they came.
    A nailhead shows you a picture of your head as seen from the inside of the diamond.
    A big dark head person with a big black hair style gets a worse nailhead than a petite blonde.
    Life is funny don't you think?
    We talk about the diamonds, but the observer and the environment is also a critical factor.
     
  8. curious
    Rough_Rock

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    by curious » Jan 22, 2002
    This chart is like reading Chinese.....?????????:confused:
     
  9. Garry H (Cut Nut)
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    by Garry H (Cut Nut) » Jan 22, 2002
    Sorry Curious you are wrong, it is Russian :)

    The info there is very technical from leonid and my good friends at Moscow State uni.
    You will not be asked to sit any exams.
     
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