A quick post about calculating diamond depth in a round diamond.
If you have a diamonds measurements, you can calculate the total depth of the diamond. The total depth is a quick guide to ensure the diamond is ‘OK’.
To calculate the depth you divide the depth by the average of the the minimum & maximum diameter. The weight of the diamond does not have any impact. The formula is the same for a 0.25ct diamond or a 50.00ct diamond. Lets do a couple:
Measurements: 6.20 – 6.30 x 4.10
Depth / Average Diamater * 100
4.10 / 6.25 * 100 = 65.6% total depth <- This diamond is quite deep and will not score a very high cut grade.
Measurements: 6.72 x 6.75 x 4.07
4.07 / 6.735 * 100 = 60.4% total depth <- This diamond has the potential to be very attractive.
That’s it! This is for round diamonds, other shapes use different formulas.