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Princess cuts: 2-3-4 Chevron.. huh?

Discussion in 'RockyTalky' started by strmrdr, Feb 6, 2009.

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  1. strmrdr
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    by strmrdr » Feb 6, 2009
    The arrows on the wire diagrams of princess cuts points to the Chevron facets.
    The first has 2 the second 3 and the third has 4 chevrons.

    234chevWire.jpg
     
    


    


  2. strmrdr
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    by strmrdr » Feb 6, 2009
    What does it mean for the diamond?
    The more chevrons the smaller the virtual facets for identical sized diamonds.*

    *Virtual facets split up the light return and form patterns in diamonds.
    The smaller the virtual facets the smaller the chunks of light returned.
    They are formed by the interaction of the actual facets with one another.

    234chevVF.jpg
     
  3. strmrdr
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    by strmrdr » Feb 6, 2009
    This is the 2 chevron notice that the chunks are rather large compared to the 3 and 4.

    2chevJS.jpg
     
  4. strmrdr
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    by strmrdr » Feb 6, 2009
    3 chevron

    3chevJS.jpg
     
    


    


  5. strmrdr
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    by strmrdr » Feb 6, 2009
    4 chevron
    Notice how the light return is split into a lot smaller chunks than with the 2 chevron and there are more of them.
    Given that there is enough light to make them all active it will show smaller and more flashes of light than the 2 chevron design.
    In low, soft light the 2 chevron has a large advantage in smaller diamonds.
    In brighter light when there is enough light to work all the virtual facets and in larger diamonds where all the virtual facets are large enough to be effective in both designs it is a personal preference issue.
     
  6. strmrdr
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    by strmrdr » Feb 6, 2009
    4 chevron

    4chevJS.jpg
     
  7. Lorelei
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    by Lorelei » Feb 6, 2009
    This is great Karl, thanks!!
     
  8. diagem
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    by diagem » Feb 6, 2009
    I kinda like the four chevron picture..., if a crushed ice look..., then crushed all the way![​IMG]
     
  9. John Pollard
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    by John Pollard » Feb 6, 2009
    Thanks Karl. Bookmarked.

    I'm always instructing our dealers about these differences. It's insanity that this is not made more clear on the report. The difference between 2-4 chevron is a difference between 24 and 40 facets on the pavilion.

    I'd add that the larger the diamond the greater justification for more facets so the surface area is broken up proportionately. For example, a 5ct diamond will need more facets than a 1ct to have similar virtual facet sizes.
     
  10. AprilBaby
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    by AprilBaby » Feb 6, 2009
    In those pictures the 4 chevron looks like it would be the prettiest.
     
    


    


  11. geckodani
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    by geckodani » Feb 6, 2009
    Very cool! Thanks Strm!

    I love this place. I learn something new every day.
     
  12. Paul-Antwerp
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    by Paul-Antwerp » Feb 6, 2009
    Yeah, but do not forget that you are looking at a +1,000 Ct diamond there.

    Live long,
     
  13. diagem
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    by diagem » Feb 6, 2009
    Hi Karl...
    Can you show what would happen with a 3 and 4 chevron which are spread wider (rather than crunched together?)
    Which naturally needs a smaller thinner P1...

    Will the visual face up appearance still have such a difference?
     
  14. strmrdr
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    by strmrdr » Feb 6, 2009
    Diagem,
    I will look into that this weekend and get back to you.
    For now I would like to keep this thread as simple as possible and not confuse people.
     
  15. strmrdr
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    by strmrdr » Feb 6, 2009
    Very good point.
    These pictures can not be used to tell which you prefer as the difference in person is different than in huge static pictures.
    I used huge pictures to make the difference easy to see.

    The goal of this thread is to inform the reader of what the difference is between them not which is better or which they might prefer.
     
    


    


  16. diagem
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    by diagem » Feb 6, 2009
    OK..., BTW..., I didnt think I asked something which is not simple....[​IMG]
     
  17. Rockdiamond
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    by Rockdiamond » Feb 6, 2009
    Awesome thread Karl!!

    Thank for pointing out the differences in such a way everyone can understand.
     
  18. Eva17
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    by Eva17 » Feb 6, 2009
    i love when you provide these visuals Karl!!

    Thank you!!!
     
  19. ChargerGrrl
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    by ChargerGrrl » Feb 6, 2009

    ditto! the visuals really help.

    I''m curious to know if my stone is a 2/3/4 chevron. it''s been a while since i''ve looked at the cert (GIA)- would it be on there?
     
  20. Tuckins1
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    by Tuckins1 » Feb 6, 2009
    Great visuals! Thanks for sharing!![​IMG]
     
  21. Todd Gray
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    by Todd Gray » Feb 6, 2009
     
  22. Catmom
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    by Catmom » Feb 6, 2009
    Thanks Karl! I love the visuals. I wish I had my old princess so I could look to see how many chevrons it had.
     
  23. John Pollard
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    by John Pollard » Feb 6, 2009
    I agree with Todd, but there are sometimes exceptions. In some instances you'll find mismatched numbers of chevron rows between quadrants. Many of these examples might not be sent to a top lab and when they are it's usually picked up - especially now that we have scan technology doing measurements that used to be manual - but some scanners still have a hard time with facet angles especially close to each other so they can "miss." When I was seeing lots of supplier diamonds brought in for inspection we'd find the occasional princess with a pavilion graphic that wasn't quite right.
     
  24. purrfectpear
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    by purrfectpear » Feb 6, 2009
    I much prefer the chunkier less faceted look. One of the things I dislike about princess diamonds is the crushed ice look.

    Now I realize I''ve seen some that have less of that effect that I liked better. Must have had less chevrons [​IMG]

    Kewl explanation Karl.
     
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