Ideal Round Brilliant - Please explain table, depth, etc

[icing]

Hi everyone,
I''m about to buy my first e-ring and wedding band...very exciting but also very scary. I was hoping someone can explain to me the numbers (table, depth, crown, pavillion, cutlet, fluorescence etc) that make a round brilliant stone an ideal cut? Also what do all those terms mean (briefly of course). If someone can guide me a website that explains these in detail, that would be great.

I will definitely post the diamonds I am considering so I can get your input! Pricescope has been so helpful!

Thanks!!

 

[icing]

Also what does HCA refer to and what is a good number?

 

[stone-cold11]

The tutorial.

https://www.pricescope.com/wiki/diamonds/

 

[stone-cold11]

HCA = Holloway Cut Adviser

https://www.pricescope.com/cutadviser.asp

Below score 2, is worthy of further investigation.

 

[Lorelei]

Date: 2/18/2010 5:56:13 PM
Author:icing
Hi everyone,
I'm about to buy my first e-ring and wedding band...very exciting but also very scary. I was hoping someone can explain to me the numbers (table, depth, crown, pavillion, cutlet, fluorescence etc) that make a round brilliant stone an ideal cut? Also what do all those terms mean (briefly of course). If someone can guide me a website that explains these in detail, that would be great.

I will definitely post the diamonds I am considering so I can get your input! Pricescope has been so helpful!

Thanks!!

Hi icing and welcome!

SC has given you a good start with the Pricescope Tutorials, below is a list of proportions some of us use as a guide to help find a well cut diamond, bear in mind it is a guide and that proportions outside of the suggested ranges can still work well in some cases.

depth - 60 - 62% - although my personal preference is to allow up to 62.4%
table - 54- 57%
crown angle - 34- 35 degrees
pavilion angle - 40.6- 41 degrees
girdle - avoid extremes, look for thin to slightly thick, thin to medium etc
polish and symmetry - very good and above

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!

From expert John Pollard.

As the above implies, configurations depend on each other. A little give here can still work with a little take there.

With that said, 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).