CALLING ALL EXPERT GEMOLOGIST

[shopgirl88]

hello,

the diamond we are interested in purchasing has triple excellent on the GIA but there’s no way for us to determine it’s brilliance and sparkle. how would this diamond rate on AGS and is this indeed ‘Excellent’? Please feel free to chime in, any expert advice would be greatly appreciated.

round
cut/polish/sym: triple excellent
table: 61%
depth: 60.5%
crown: 33
pav: 41.6
star: 50%
lower pav: 80%

 

[SMC]

hello,

the diamond we are interested in purchasing has triple excellent on the GIA but there’s no way for us to determine it’s brilliance and sparkle. how would this diamond rate on AGS and is this indeed ‘Excellent’? Please feel free to chime in, any expert advice would be greatly appreciated.

round
cut/polish/sym: triple excellent
table: 61%
depth: 60.5%
crown: 33
pav: 41.6
star: 50%
lower pav: 80%

Have you tried plugging the numbers into the HCA calculator? This scores a 5.2 which isn't very good. You want below 2.
https://www.pricescope.com/tools/hca

 

[John P]

hello,

the diamond we are interested in purchasing has triple excellent on the GIA but there’s no way for us to determine it’s brilliance and sparkle. how would this diamond rate on AGS and is this indeed ‘Excellent’? Please feel free to chime in, any expert advice would be greatly appreciated.

round
cut/polish/sym: triple excellent
table: 61%
depth: 60.5%
crown: 33
pav: 41.6
star: 50%
lower pav: 80%

By the basic numbers it's not a strong candidate for AGS. 61/41.6/33.0 is predicted to receive AGS5 in light performance due to the steep pavilion angle.

 

[04diamond<3]

the table and pavillion are too big. Table should be between 55-57 some will go up to 58 and pavillion you want it to stay around 41 at most. What's your budget?

 

[John P]

the table and pavillion are too big. Table should be between 55-57 some will go up to 58 and pavillion you want it to stay around 41 at most. What's your budget?

This should not be a hard rule. The diamond's entire geometry and cut-precision determines its level of light return and optical performance tendencies. There are many stunning diamonds with tables >57. There are even diamonds with good PA/CA combos where the PA is slightly above 41.0 (but the pavilion angle advice you gave is more solid on the whole).

Example: If the diamond in question had 60T 41.0 PA and a CA between 32.0-34.0 it could have terrific performance and potentially earn highest marks from the GIA, AGS and HCA.

Both AGS and GIA permit tables up to 62% in their top grades. Tiffany and Cartier permit up to 60.4% and some of the world's most high-octane auctions frequently feature diamonds in the 60T category going for multi-millions of dollars.

For instance...how about this 5 Carat bad-boy? I don't suppose anyone would throw him away for having that 60T would they?
(also GIA EX and AGS0).

 

[04diamond<3]

the table and pavillion are too big. Table should be between 55-57 some will go up to 58 and pavillion you want it to stay around 41 at most. What's your budget?

This should not be a hard rule. The diamond's entire geometry and cut-precision determines its level of light return and optical performance tendencies. There are many stunning diamonds with tables >57. There are even diamonds with good PA/CA combos where the PA is slightly above 41.0 (but the pavilion angle advice you gave is more solid on the whole).

Example: If the diamond in question had 60T 41.0 PA and a CA between 32.0-34.0 it could have terrific performance and potentially earn highest marks from the GIA, AGS and HCA.

Both AGS and GIA permit tables up to 62% in their top grades. Tiffany and Cartier permit up to 60.4% and some of the world's most high-octane auctions frequently feature diamonds in the 60T category going for multi-millions of dollars.

For instance...how about this 5 Carat bad-boy? I don't suppose anyone would throw him away for having that 60T would they?
(also GIA EX and AGS0).

Excuse me. I should have said that that was my preference.

 

[TitanCi]

the table and pavillion are too big. Table should be between 55-57 some will go up to 58 and pavillion you want it to stay around 41 at most. What's your budget?

This should not be a hard rule. The diamond's entire geometry and cut-precision determines its level of light return and optical performance tendencies. There are many stunning diamonds with tables >57. There are even diamonds with good PA/CA combos where the PA is slightly above 41.0 (but the pavilion angle advice you gave is more solid on the whole).

Example: If the diamond in question had 60T 41.0 PA and a CA between 32.0-34.0 it could have terrific performance and potentially earn highest marks from the GIA, AGS and HCA.

Both AGS and GIA permit tables up to 62% in their top grades. Tiffany and Cartier permit up to 60.4% and some of the world's most high-octane auctions frequently feature diamonds in the 60T category going for multi-millions of dollars.

For instance...how about this 5 Carat bad-boy? I don't suppose anyone would throw him away for having that 60T would they?
(also GIA EX and AGS0).

60T? BARF! I would throw him away instantly!

 

[Karl_K]

I am too lazy to post it twice see this thread here for my opinion:
[URL='https://www.pricescope.com/community/threads/color-improved-by-cut.187490/']https://www.pricescope.com/community/threads/color-improved-by-cut.187490/[/URL]

 

[John P]

60T? BARF! I would throw him away instantly!

Hey hey. Remind me to go dumpster-diving in your 'hood!

 

[shopgirl88]

thank you everyone for your input. this was very helpful. looks like there are always exceptions to the rule but the best rule of all is to see the diamond in person? (hehe)

what is everyone's take on this rock? Is there potential here? or is there potential for fish eye instead? (eek)

tab: 59
dep: 58.9
cr: 33.5
pav: 40.8

gia rates this:
cut = vg
polish = ex
sym = vg

 

[04diamond<3]

Well, that one scored a 1.1 on the HCA which is good...but yes, I'd recommend seeing it. Again, for me personally the table is too big.

 

[JulieN]

no fisheye with that one.

 

[John P]

what is everyone's take on this rock? Is there potential here? or is there potential for fish eye instead? (eek)

tab: 59
dep: 58.9
cr: 33.5
pav: 40.8

gia rates this:
cut = vg
polish = ex
sym = vg

With those numbers the girdle runs to Very Thin. That explains why it received VG in cut. It will be a bright performer but, if you're considering it, the girdle should be inspected so you know any durability implications/setting-limitations.

 

[shopgirl88]

thank you john.

 

[John P]

thank you john.

My pleasure.