shape
carat
color
clarity

# discrepancy between HCA and GIA tables

#### BayouKip

##### Rough_Rock
Can someone explain to me the discrepancy between the HCA and GIA tables in regard to a diamond with the following measurements:

Depth:
61.4%
Table:
58%
Crown:
34 degrees
Pavilion
41.4 degrees

The hca gives a value of 4.7, however the GIA tables list it well within the excellent cut regions http://www.gia.edu/diamondcut/pdf/booklet_cut_estimation_tables_lowres.pdf

Thanks for the help!

#### JulieN

##### Super_Ideal_Rock
There is a difference of opinion.

I would look for another diamond.

#### BayouKip

##### Rough_Rock
Right, I guess what I am asking is both plot crown and pavilion angles as a function of table %, in what way are the two opinions so radically different, im trying to get an idea for what it would look like in real life

#### Rockdiamond

##### Ideal_Rock
It's true- there are many differing opinions.
Speaking in general terms: I look at each diamond holistically.
What I mean is, if I'm looking at a 1.00 D/VS1, I might agree with the type of stone the HCA would prefer.
If it's a 5.65ct M/VS1, it would very likely be , for me at least, a different type of stone I'd prefer.

Is this a stone you are looking at in person?

#### BayouKip

##### Rough_Rock
Unfortunately not, I'm looking at a lot of different stones online. I'm an amateur. I'm looking for some sort of consensus on with the different models (GIA, AGS, HCA).

#### slg47

##### Ideal_Rock
GIA, AGS, and HCA use different parameters for cut. In general I think you are safest with AGS ideal (usually don't need HCA here) or GIA Ex with HCA < 2. Pictures and idealscope images can also help you evaluate cut.

#### Rockdiamond

##### Ideal_Rock
BayouKip said:
Unfortunately not, I'm looking at a lot of different stones online. I'm an amateur. I'm looking for some sort of consensus on with the different models (GIA, AGS, HCA).

There's not going to ever be a consensus on which table and depth/ PA/CA LGF combo is best. GIA's range is wider than AGSL- these are the two accepted cut grades by the trade at large.
It's a range. GIA's range is wider- some could argue that makes AGSL a "better" cut grade.
I look at it holistically. Gotta look at the diamond to know
If you could look at some diamonds in real life- hopefully some with GIA, or AGSL reports, you'd have a much better starting point.