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Ideal cut for GIA certified diamonds?

Discussion in 'RockyTalky' started by mclapham, Nov 2, 2004.

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  1. mclapham
    Rough_Rock

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    by mclapham » Nov 2, 2004
    Given that we don't have crown/pavillion data for a GIA certified diamond, how do you determine whether its an ideal cut. Is the table/depth ratio sufficient along with looking at the symmetry and polish and culet, girdle?

    Would this classify as ideal:
    Depth: 60-62
    Table:55-57

    symmetry/polish of at least v.good


    Culet: None, pointed, v.small, small, medium
    Girdle: thin, med, slightly thick

    Going to an independent jeweller, they only show me the GIA certificate, and all of them say its ideal if it meets the above specs. They don't have any other certifications.
     
  2. Patty
    Ideal_Rock

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    by Patty » Nov 2, 2004
    You cannot tell if a GIA certified diamond is an ideal cut unless you also have a Sarin report. The Table and Depth ranges that you quote are a good start, though!
     
  3. aronsh
    Rough_Rock

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    by aronsh » Nov 2, 2004
    I am no expert, but I believe the only lab that can certify an ideal cut is the AGS lab
     
  4. Garry H (Cut Nut)
    Super_Ideal_Rock
    Trade

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    by Garry H (Cut Nut) » Nov 2, 2004
    You can not tell - see the 60:60 section in the tutorial.

    You can ask for the store to get a Sarin report on diamonds that seem to be the best spakliest, but some will not do it, or you can buy your own ideal-scope for $25 plus postage.

    It is not easy I am afraid.
     
  5. irish
    Rough_Rock

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    by irish » Nov 3, 2004
    I''m looking at a Princess cut diamond. The Table is 75% and the Depth is 69.7. Can you tell me if it is in good proportions ? Thanks
     
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