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Freak diamonds...

Discussion in 'RockyTalky' started by muddy guy, Apr 19, 2002.

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  1. muddy guy
    Rough_Rock

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    by muddy guy » Apr 19, 2002
    Okay, here's what I'd like to know...

    Have any of you experts, or experienced consumers out there ran a stone through the HCA, had it get a great rating (less than 1?), then upon actually viewing the stone decided it was not a good performer at all? Dull? Lifeless? Ugly? Huh? I know you don't proclaim the HCA to be an acid test, but what have you experienced?

    Muddy
     
    


    


  2. oldminer
    Ideal_Rock
    Trade

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    by oldminer » Apr 19, 2002
    I have had no surprises..... The Ideal-Scope also allows no surprises. The HCA is an excellent indicator of performance.
     
  3. pricescope
    Ideal_Rock

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    by pricescope » Apr 19, 2002
    I think it's also a matter of taste and illumination conditions.

    I've heard that inexperienced buyers were not able to see a difference between HCA excellent and very good in office environment.

    Some light leaking diamonds look nice while loose but not as good when set.
     
  4. Garry H (Cut Nut)
    Super_Ideal_Rock
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    by Garry H (Cut Nut) » Apr 20, 2002
    A couple of comments.

    1. HCA does not see the stone and can not know about the symmetry. Some non symetric stones can look better, but most look worse.

    2. If a diamond is on the shallow side and has very short pavilion mains it can appear very dark and lifeless. This is uncommon, but does happen.

    3. We saw a stone the other day that was a dreadful anomally - it had very steep upper girdle facets - but an ideal-scope peek told us not to buy it.

    Both these latter occurences are 1 in a 1000.

    4. Were you looking at unset diamonds held in tweezers?
    HCA assumes no light can enter the pavilion, where as many diamonds 'experts' do all their analysis with loose diamonds and are fooled by light leaking from behind the pavilion in diamonds that die when set.

    The moral is hCA is a fantastic preselection tool, but we strongly recomend you use an appraiser or at the very least get an ideal-scope.
     
    


    


  5. muddy guy
    Rough_Rock

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    by muddy guy » Apr 20, 2002
    Okay, how about this stone, which measures up an awesome .3 ex-ex-ex-ex on HAC, but only has good symmetry? Waddaya think?

    Shape and Cutting Style Round Brilliant
    Measurements 6.53-6.59x3.92
    Weight 1.01 Cts.
    Proportions
    Depth 59.8 %
    Table 58 %
    Girdle Thin to Medium
    Culet None
    Finish
    Polish Excellent
    Symmetry Good
    Clarity Grade VS2
    Characteristics
    Color Grade H
    Fluorescence none
    :))
     
  6. pricescope
    Ideal_Rock

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    by pricescope » Apr 20, 2002
    Looking very nice :lickout:
     
  7. muddy guy
    Rough_Rock

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    by muddy guy » Apr 21, 2002
    Oh, good! Thanks so much for your reply, Leonid. Oh, by the way, I forgot to include the actual Sarin data, in case anyone can spot a problem that the HCA might not?

    depth: 59.9%
    table: 58%
    crown.ang: 33.0 deg
    crown height: 14.0% ---0.92 mm
    pavil.ang:40.9 deg
    pavil.depth: 42.9%
    culet:1.1%
    girdle: 0.76% - 1.37%

    Starting to feel better and better about this SCARY purchase! :bigsmile:
     
  8. pricescope
    Ideal_Rock

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    by pricescope » Apr 21, 2002
    It souds like very nice stone. Plug the Sarin data into Cut Adviser.
     
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