Depth Percentage Clarification

[SamuelS]

Is depth percentage the same percent I should be looking at to be between 56% and 64%? Take this for example: https://www.withclarity.com/diamond/408826764/0.71-Round-F-VS1-Ideal

 

[oldminer]

A depth % ranging from 56% to 64% is overly large a "range" for the best cut in round diamonds. However, just selecting based on depth% is not a great way to make a search.

 

[SamuelS]

I only use those values because of this post on here:

"How do you know if the diamond you are considering has a good spread? If you divide the depth by the diameter and multiply by 100 you can calculate the depth percentage. This should be between 56% and 65%. If the table is small the depth will can be larger, and vice a versa. The smaller the depth percentage, the larger the spread. Other factors that effect spread are the girdle thickness and crown and pavilion angles."

 

[lovedogs]

No--that range is too large. Depth should be between 60 and 62.4

 

[Rockdiamond]

How do you know if the diamond you are considering has a good spread?

This is pretty simple- especially if you're looking at round diamonds.
For example- a 1.00ct round diamond averages about 6.3mm ( off the top of my head)
If you start to look at large numbers of stones it's likely that those with lower depth percentages will have greater spread than those of the same weight with higher depth percentages.

You might look at the physical dimensions are part of an overall assessment. In my experience, many consumers are concerned with how large their diamond looks.
I will totally agree with @oldminer that depth % in and of itself is not a reliable means of selecting a diamond.

 

[Garry H (Cut Nut)]

I made mention of depth % here.
It is a crude measurement used by dinosaurs in the trade.
(none of those in this thread though)

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