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thegodfather

Rough_Rock
Joined
Dec 26, 2006
Messages
13
Looking at a 1.73ct GIA graded I, Si2, 63.7% depth, 58% table, 35.5° crown angle, 41.8° pavilion angle, Final cost $8,700. Good buy or not. Didn''t score well HCA. Any thoughts?
 

diamondseeker2006

Super_Ideal_Rock
Premium
Joined
Jan 11, 2006
Messages
55,048
How did it look? If you really loved it, then the numbers don''t matter! But it would not fall into ideal cut range. What did the GIA cert say for cut? I''d also be very careful to check out SI2 inclusions. SI1 and VS2 are usually safer for a ring stone (but that is my personal preference, not a rule!). It may be a pretty good price for what it is. You can get a better diamond than that, but it will probably cost a little more.
 

thegodfather

Rough_Rock
Joined
Dec 26, 2006
Messages
13
It looked great, GIA graded the the cut "very good" The clarity was a SI2 due to a feather that didn''t affect the look to the naked untrained eye.
 

Ellen

Super_Ideal_Rock
Joined
Jan 13, 2006
Messages
24,426
Please stick to the guidelines ds and I gave you.

This stone is way too deep in depth, and the CA and PA are not complimentary.

I have nothing against an SI2, IF it''s totally eyeclean.

Try again.


Or, if you want to tell us your budget we''d be glad to help!
 

kenny

Super_Ideal_Rock
Premium
Joined
Apr 30, 2005
Messages
26,924
Date: 12/30/2006 1:00:46 PM
Author:thegodfather
Looking at a 1.73ct GIA graded I, Si2, 63.7% depth, 58% table, 35.5° crown angle, 41.8° pavilion angle, Final cost $8,700. Good buy or not. Didn't score well HCA. Any thoughts?
If it didn't score well don't buy it.

The math behind the HCA may be complex but the concept is simple.
A well cut diamond (score under 2.0) will return more of the light entering the top back through the top.
Light will not leak out the bottom.
The stone will not have a dark center or other problems.

Think of a person standing across the room with a mirror.
She has to hold the mirror at just the right angle for you to see yourself in the mirror.
If the angle is off the light will not go where it is supposed to go.

A diamond is just a complex little box of many mirrors and windows.
They will work together and do their job only if every surface is at the right angle.

HCA score tells you how well a diamond does its job.


BTW notice your diamond is very deep.
They do that to save more of the rough diamond material to make a heavier stone.
The public wants heavy stones, they don't understand that when they are cut for weight the angles make it perform poorly.
That diamond makes more money for the owner because they didn't grind away as much of the precious material.

In order for a diamond to perform well it has to be more shallow.
95% of diamonds are NOT cut well.
The public is ignorant.
All they know is they want a 1-carat.

You are one of the lucky ones.
You are getting informed.
You stand a chance of getting one of the few well-cut stones.

Don't blow it.
 

diamondseeker2006

Super_Ideal_Rock
Premium
Joined
Jan 11, 2006
Messages
55,048

thegodfather

Rough_Rock
Joined
Dec 26, 2006
Messages
13
Thanks guys I''m learning. Found another pleasing to the eye, but still doesn''t fall below 2.0 on the HCA. 1.7ct, J, VS1, GIA, Excelent, Ideal cut. table depth 60.8%, table size 58%, Crown angle, 34.5 degrees, pavillion angle 41.2 degrees? cost of $10,000.
 

kenny

Super_Ideal_Rock
Premium
Joined
Apr 30, 2005
Messages
26,924
How to find diamonds guaranteed to score 2.0 or under:

Near the top of this page click on PRICES.
Select, "Search by Cut"

Under Cut select Excellent to Excellent.
Enter the rest of your values.
Press Go.

You will see a list of diamonds and even see their HCA scores.
 

kcoursolle

Super_Ideal_Rock
Joined
Jan 21, 2006
Messages
10,589
It''s too deep, it will appear like a 1.5 carat stone and probably doesn''t have great light return. I wouldn''t get it.
 

diamondseeker2006

Super_Ideal_Rock
Premium
Joined
Jan 11, 2006
Messages
55,048
Date: 12/30/2006 2:27:36 PM
Author: thegodfather
Thanks guys I''m learning. Found another pleasing to the eye, but still doesn''t fall below 2.0 on the HCA. 1.7ct, J, VS1, GIA, Excelent, Ideal cut. table depth 60.8%, table size 58%, Crown angle, 34.5 degrees, pavillion angle 41.2 degrees? cost of $10,000.
You still need to add the diameter to this list so we can tell if the stone is facing up as large as it should. Also, the girdle.
 

kenny

Super_Ideal_Rock
Premium
Joined
Apr 30, 2005
Messages
26,924
Date: 12/30/2006 2:35:33 PM
Author: kenny
How to find diamonds guaranteed to score 2.0 or under:
Near the top of this page click on PRICES.
Select, 'Search by Cut'
Under Cut select Excellent to Excellent.
Enter the rest of your values.
Press Go.
You will see a list of diamonds and even see their HCA scores.

I just did this.
I entered weight: 1.5 - 1.8 ct
Cut Ex to Ex
H to J
VS1 to SI2
Any lab

It found 43 stones, all with an HCA score of 2.0 or under.
Priced from $7880 to $16,470
 
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