Your expert opinions please!

[venezia]

Finally considering a pair of 2ct x 2 diamond studs. Here are the GIA reports. My local jeweler says they are H&A's but I am not sure. What do you think of these?

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[Todd Gray]

H&A with a crown angle of 33.5 degrees offset by a pavilion angle of 41.2 degrees?!?! Uh, yea... And the other stone has a crown angle of 34.5 degrees offset by a pavilion angle of 40.0 degrees! Oh please ask the vendor for pictures of these diamonds as seen through a Gems Fantasy Scope! I can''t wait to see what this retail jeweler considers to be a crisp and complete pattern of Hearts & Arrows!

 

[stone-cold11]

Could be ok, but I sure would like them to be closer in angles. Probably not H&A. If he claims it to be, ask him to show you the hearts image.

Report check link:

Stud 1

Stud 2

 

[Lorelei]

Date: 6/30/2009 4:51:49 PM
Author: Todd Gray
H&A with a crown angle of 33.5 degrees offset by a pavilion angle of 41.2 degrees?!?! Uh, yea... And the other stone has a crown angle of 34.5 degrees offset by a pavilion angle of 40.0 degrees! Oh please ask the vendor for pictures of these diamonds as seen through a Gems Fantasy Scope! I can't wait to see what this retail jeweler considers to be a crisp and complete pattern of Hearts & Arrows!

LOL! Ditto! I very much doubt these are h&a cuts, and from the proportions you can do much better. Cut quality is so important even for earrings as without they won't sparkle and look how you want them to.

 

[venezia]

Thanks Stonecold for putting up the GIA reports. Did not know I was not supposed to send links.

OK what kind of angles should I be looking for in a H&A? I have tried reading some tutorials etc. but if someone can please educate me a little in layman''s language I would really, really appreciate it! Thanks!

 

[Lorelei]

Date: 6/30/2009 6:02:33 PM
Author: venezia
Thanks Stonecold for putting up the GIA reports. Did not know I was not supposed to send links.

OK what kind of angles should I be looking for in a H&A? I have tried reading some tutorials etc. but if someone can please educate me a little in layman's language I would really, really appreciate it! Thanks!

Here are some numbers you can use as a guide to help you find a well cut round diamond. However hearts and arrows is a type of strict precision cut, if that is what you are looking for is a h&a diamond then I would suggest you contact the following vendors who all sell beautiful h&a diamonds. Basically the proportions are extremely important in order for you to have a beautiful diamond, but the overall cut precision is crucial if you want superb h&a patterning, and images particularly of the hearts from the underside of the diamond are imperative. Really it is easier to go with one of the vendors below to get a h&a diamond, also you can find some well cut diamonds may show a strong arrow pattern and hearts but do not meet the standards as stated by experts. Often the hj&a diamonds will also be AGS0 cut grade, some of which can fall within the numbers suggested below.

Also this tutorial explains further.

http://diamonds.pricescope.com/hna.asp

www.goodoldgold.com

www.highperformancediamonds.com

www.briangavindiamonds.com

www.niceice.com


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).