Confused about HCA numbers

[diamondnut]

Hi everyone,

I'm comparing two stones using the HCA tool and am confused about how a stone that gets a HCA rating of Ex/Ex/VG could score better (1.3) than one with a HCA rating of Ex/Ex/Ex (1.6). Any thoughts on this?

Thanks!

 

[Lorelei]

Date: 8/7/2008 11:38:45 AM
Author:diamondnut
Hi everyone,

I'm comparing two stones using the HCA tool and am confused about how a stone that gets a HCA rating of Ex/Ex/VG could score better (1.3) than one with a HCA rating of Ex/Ex/Ex (1.6). Any thoughts on this?

Thanks!

A lower score isn't better than a higher score, the HCA is an elimination tool only, not used for selection. The aim is to find a diamond which scores 2 or below in most cases, then evaluate the diamond using Idealscope images, trusted vendor input and your own eyes ultimately.

Did you want to post the proportions and colour, clarity etc for each diamond, then perhaps we can help, both sound promising.

 

[Skippy123]

Date: 8/7/2008 11:43:19 AM
Author: Lorelei

A lower score isn''t better than a higher score, the HCA is an elimination tool only, not used for selection. The aim is to find a diamond which scores 2 or below in most cases, then evaluate the diamond using Idealscope images, trusted vendor input and your own eyes ultimately.

Did you want to post the proportions and colour, clarity etc for each diamond, then perhaps we can help, both sound promising.

Ditto, I agree post info on the stone so we can help, narrow it down

.

 

[diamondnut]

Thanks for your quick replies! Here are the 2 stones in question. What do you think?


Stone 1
HCA score: 1.3 Ex/Ex/VG
.91ct, D, VS1
6.25-6.30 x 3.85
symmetry: EX
polish: EX
flor: none
culet: none
girdle: thin-med, faceted
table: 56%
depth: 61.4%
crown 34%
pavillion 41%



Stone 2
HCA score: 1.6 Ex/Ex/Ex
.92ct, D, SI1
6.19-6.23 x 3.86
symmetry: EX
polish: EX
flor: none
culet: none
girdle: med, faceted
table: 56%
depth: 62.2%
crown 35%
pavillion 40.8%

 

[Garry H (Cut Nut)]

if you want an answer then you can read www.diamond-cut.com.au

but simply, there are numbers and ranges behind each grade. Ex is 0-2, VG is 2-4