Measurements and Depth Percentage


All measurements and proportions are shown in Appendix
III
.

 
Confirming the largest and smallest diameter of a diamond with a micrometer is
difficult. This survey did not attempt to check the accuracy of diameter
measurements, which are generally reported by a Sarin Technologies scanning
device. Diameter variations of 0.01 to 0.03mm were common. Depth measurements
varied from none to 0.03mm, with an average of less than 0.02mm. It is a common
practice to identify a diamond, or to ensure that a diamond matches its report,
by comparing its measurements to those on the certificate.

 
Measurement variations led to inconsistencies in depth percentages, which
varied by an average of 0.4% and as much as 0.7% between different
laboratories. Depth percentages and table size ratios are used by many buyers
to make purchasing decisions; therefore measurement accuracy affects a diamonds
market value.

 
 

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