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Low crown angle- advice?

P: 11/23/2007 12:30:46 AM
Green with Envy Ideal Rock Total Posts: 767 Last Post: 11/21/2009 Member Since: 6/25/2007	This RB seems to have lower crown angle than other AGSO. How will this affect the apperance of the diamond? ********************** The BIG day... June 25, 2010! **********************
Posted: 11/23/2007 12:30:46 AM

There are 4 replies to this message. There are 4 replies on this page.

P: 11/23/2007 12:41:39 AM
Green with Envy Ideal Rock Total Posts: 767 Last Post: 11/21/2009 Member Since: 6/25/2007	It scores 0.8 Ex on the HCA with all EX. here is pic... ********************** The BIG day... June 25, 2010! **********************
Posted: 11/23/2007 12:41:39 AM

P: 11/23/2007 12:46:08 AM
Garry H (Cut Nut) Ideal Rock Total Posts: 11,582 Last Post: 11/24/2009 Member Since: 8/16/2000	Will look bright and will not show dirt as much as a deeper stone. Read the HCA "warning" for more info. Slightly higher risk of chipping in an exposed ring setting - perfect for pendants and earrings as they gather less light from the floor than Tolkowsky and deeper stones Garry Holloway FGAA DipDT HCA and Ideal-scope developer http://www.ideal-scope.com and http://www.HollowayDiamonds.com.au
Posted: 11/23/2007 12:46:08 AM

P: 11/23/2007 1:31:56 AM
Green with Envy Ideal Rock Total Posts: 767 Last Post: 11/21/2009 Member Since: 6/25/2007	Got it- good for pendant. Will it also have less fire, but look brighter? If is has lower crown angle.... will that effect darkness that sometimes the H&A's have under table in certain lighting? ********************** The BIG day... June 25, 2010! **********************
Posted: 11/23/2007 1:31:56 AM

P: 11/23/2007 10:53:56 AM
JohnQuixote Ideal Rock Total Posts: 5,212 Last Post: 5/24/2008 Member Since: 9/9/2004	Hi GWE & GH. I'd like to mention that a 33.9 degree crown angle is not what we would ever call low in terms of 'shallow' or less druable. The GIA used to flag diamonds at 30 degrees and below. We, along with many of our reputable peers, exercise caution before that - always looking at the girdle too - but 33.9 is in a safe zone. Official GIA definitions: Slightly shallow crown = at or near 31.5 Moderately shallow crown = at or near 26.5 Shallow crown = at or near 22.0 Very shallow crown = at or near 20.0 Extremely shallow crown < 20.0 Some discussion before (shallow crown thin girdle thread) for any interested. John __________________________ John Pollard Whiteflash Director of Education 2004-2007
Posted: 11/23/2007 10:53:56 AM

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