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How bad is 4.9 visual perf. vs. other stones?

Discussion in 'RockyTalky' started by drewg350, Jan 11, 2001.

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  1. drewg350
    Rough_Rock

    Messages:
    10
    Joined:
    Jan 16, 2001
    by drewg350 » Jan 11, 2001
    I purchased this stone with the following stat.'s. It comes up with 4.9 on the Holloway cut advisor and states "only purchase if price is a concern". I realize I don't have an "EightStar", but when I look at 90% of stones offered for sale I see alot worse Depth percentages and Pavil/Crown angles than mine. Is this stone really all that bad? What is the average "Visual Perf." score? I feel like I have a lemon after running it through the cut advisor.
    GIA 11357343
    Round Brilliant
    Measurements----------7.35-7.43 x 4.58 mm
    Weight----------------1.52 caret
    Depth-----------------61.6%
    Table-----------------56.9%
    Crown-----------------34.2' / 14.3%
    Pavil-----------------41.3' / 43.9%
    Culet-----------------0.6% None
    Girdle----------------1.8% (1.0-2.4) Faceted
    Polish----------------Very Good
    Symmetry--------------Very Good
    Clarity---------------Internally Flawless
    Color-----------------H
    Fluorescence----------None
    Price-----------------$11,900.00
     
    


    


  2. pricescope
    Ideal_Rock

    Messages:
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    Dec 31, 1999
    by pricescope » Jan 11, 2001
    Drew,Here is an example how pavilion angle affects brilliance. These stones are listed at www.goodoldgold.com along with Brilliancescope data. You can see that while pavilion angle increases from 40.5 to 41.2 the Brilliancescope readings show drop of the brilliance and scintillation. Cut adviser ratings show the same trend. 1. http://www.goodoldgold.com/148.htm
    56% table, 34.7° crown angle, 40.5° pavilion angle
    BrillianceScope: VH1/VH3/H2
    HCA: 0.8 - Excellent 2. http://www.goodoldgold.com/149.htm
    56% table, 34.4° crown angle, 40.8° pavilion angle
    BrillianceScope: H3/VH2/H1
    HCA: 1.7 – Excellent 3. http://www.goodoldgold.com/183.htm
    54% table, 34.7° crown angle, 41° pavilion angle
    BrillianceScope: H/VH/VH
    HCA: 2.8 - Very Good

    4. http://www.goodoldgold.com/184.htm
    55% table, 34.6° crown angle, 41.1° pavilion angle
    BrillianceScope: H1/VH1/M2
    HCA: 3.5 - Very Good 5. http://www.goodoldgold.com/177.htm
    59% table, 34.1° crown angle, 41.2° pavilion angle
    BrillianceScope: H2/H2/H2
    HCA: 4.1 - Good
     
  3. oldminer
    Ideal_Rock
    Trade

    Messages:
    6,292
    Joined:
    Sep 3, 2000
    by oldminer » Jan 11, 2001
    Drew:Don't torture yourself so much. If you really don't want the diamond you have, get a different one. They are readily available. You are spending plenty of money and ought to be able to totally please yourself and remove any anxiety. Nothing anyone tells you will make this diamond different than it is. Go look at perfectly cut stones first and make an better informed decision based on what YOU see or can't see.I would never recommend to an individual to have their diamond recut as you are going to assume all the risk of unlikely but possible damage in recutting. That is a loss you are not prepared to take. Just select another stone and pay the price..Happy hunting!------------------
    David Atlas
    Accredited Gem Appraisers
     
  4. pricescope
    Ideal_Rock

    Messages:
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    by pricescope » Jan 11, 2001
    Oldminer,You are the word of wisdom! So great to see you here! [​IMG]Although I understand Drew's concerns too... leonid
     
    


    


  5. pricescope
    Ideal_Rock

    Messages:
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    Joined:
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    by pricescope » Jan 11, 2001
    Hi Drew,I think we already met somewhere [​IMG]Seriously, you are right there are tons of much worse stones out there. You've said David Atlas had seen the stone. What does he think? This stone is belonging to his 2A grade because of the deep pavilion, i.e. it is not an ideal cut.Garry Holloway penalizes quite hardly stones that are not good enough. I ran your proportions on the DiamCalc software. It shows that for this crown and pavilion angles the stone starts to leak the light under the table and loosing its brilliance.If you would look on the MSU charts ( www.gemology.addr.com/cut/english/podrobno_2.htm ) you will see that for this combination of C&P the light return is getting below Tolkowsky.On the other hand, the price is quite fair for this stone. So if you only want to get better cut and cannot exchange it for another one you might want to consider recutting it in order to get pavilion angle about 40.6’-40.7’.Hope it helps,Leonid
     
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