Total Depth < 60%

[00dmn]

I have a question regarding total depth. Multiple people have told me that having a total depth under 60% will not yield as high performing a diamond. However, when you put the numbers into the HCA, you can still get 4 Excellents and a total score <1 going all the way down to 58%. So my question is, what is the real effect of having a shallower diamond and will all diamonds in the 58-59% range be poor performers?

 

[denverappraiser]

Total depth is the sum of the crown, girdle and pavilion measurements. It’s useful for identifying the individual stone but it doesn’t tell you much about the optics. Within a particular depth there can be both excellent and dreadful stones.

The 60% number is provided as a thumbnail guide because it appears on most grading reports where the crown and pavilion measurements usually don’t.

Neil Beaty
GG(GIA) ISA NAJA
Professional Appraisals in Denver

 

[strmrdr]

Where are you getting the numbers to put in?

The hca will accept some impractical combos and give them good scores.
Its not a research and develpment tool it doesnt check enough stuff it is a fast diamond rejection tool that tells you if the crown and pavilion angles work together.

 

[00dmn]

The numbers were not from a real stone. I was just playing around with lots of different combinations. That could be the problem. So are there any possible proportion combinations for a stone with a 58-59% total depth to be a very good performing stone?

 

[valeria101]

Date: 11/1/2005 9:52:13 AM
Author: 00dmn

So are there any possible proportion combinations for a stone with a 58-59% total depth to be a very good performing stone?

Yes, you just found them

If you asked about 55% depth I''d start wondering, not those.