the real total depth

[sexyseiko]

I''d read from several forum that total depth of diamond = crown height+girdle thickness+pavillion depth.
However I came across a website saying that''s not accurate way of finding total depth instead they use formula to calculate it
by using average diameter/depth x100

which way has more accuracy.Thanks in advance.

 

[stebbo]

Date: 11/14/2007 5:18:44 AM
Author:sexyseiko
I'd read from several forum that total depth of diamond = crown height+girdle thickness+pavillion depth.

However I came across a website saying that's not accurate way of finding total depth instead they use formula to calculate it

by using average diameter/depth x100


which way has more accuracy.Thanks in advance.

The second way (but corrected to depth/ave diameter x 100) will accurately give you the depth % you see around the place (for rounds ie.)

The first way I use more for estimating the average bezel girdle width from the depth % and the average crown and pavilion heights (but note this is different to the variety of girdle widths you'll see on reports).

 

[Garry H (Cut Nut)]

Date: 11/14/2007 5:18:44 AM
Author:sexyseiko
I''d read from several forum that total depth of diamond = crown height+girdle thickness+pavillion depth.
However I came across a website saying that''s not accurate way of finding total depth instead they use formula to calculate it
by using average diameter/depth x100

which way has more accuracy.Thanks in advance.

For a round it is the depth / by average diameter

For other shapes it is the depth / smallest diameter

Some squarish propritary fancy shape stones cheat and use corner instead of smallest diameter

Adding the other #''s has inherent errors, but in theory gets you the same #.
Often this # will be 1.6% or 1.7% less because of girdle measurment placement (valleys or thicker parts)

 

[diagem]

Date: 11/14/2007 5:18:44 AM
Author:sexyseiko
I''d read from several forum that total depth of diamond = crown height+girdle thickness+pavillion depth.
However I came across a website saying that''s not accurate way of finding total depth instead they use formula to calculate it
by using average diameter/depth x100

which way has more accuracy.Thanks in advance.

Some recent thread on Total Depth calculations:

https://www.pricescope.com/community/threads/are-total-depth-calculations-always-correct.72128/