llcoooooljay
Rough_Rock
- Joined
- Dec 10, 2008
- Messages
- 27
Date: 2/2/2009 4:14:17 AM
Author:llcoooooljay
Are there specific numbers that newbies should be looking for in crown and pavillion angles? i have a diamond that has a crown angle of 33.5 (is that too steep?) and a pavillion angle of 40.8. are those within a good range? please let me know. thanks
note - with crown and pavilion angles at the shallower ends ( CA 34- PA 40.6) and steeper ( CA 35- PA 41) check to make sure these angles complement in that particular diamond - eyeballs, Idealscope, trusted vendor input - check as appropriate!
Also here are some good angle combos which might help from one of the experts John Pollard.
Here's a "Cliff's Notes" for staying near Tolkowsky/ideal angles with GIA reports (their numbers are rounded): A crown angle of 34.0, 34.5 or 35.0 is usually safe with a 40.8 pavilion angle. If pavilion angle = 40.6 lean toward a 34.5-35.0 crown. If pavilion angle = 41 lean toward a 34.0-34.5 crown.
GIA "EX" in cut is great at its heart, but it ranges a bit wider than some people prefer, particularly in deep combinations (pavilion > 41 with crown > 35).
I just wanted to add when using the HCA, scores below 2 are considered a ' pass pending further evaluation' and this is done with idealscopes etc to make sure that particular diamond is suitable for the intended purpose.Ditto. Also, a Sarin or Helium report can be used to assess if IS pic is not available.Date: 2/2/2009 4:23:40 AM
Author: Lorelei
I just wanted to add when using the HCA, scores below 2 are considered a ' pass pending further evaluation' and this is done with idealscopes etc to make sure that particular diamond is suitable for the intended purpose.