Diamond Math for the Trig Challenged

Ever wonder how to find the important pavilion and crown main angles from measurements of pavilion depth or table size and crown height? Here's how to get those angles with the help of a couple of buttons on a $16 scientific calculator or the free Windows scientific calculator accessory on your computer. You can use the following steps to check the consistency of angle and percentage results from devices like the Sarin, OGI, or your GIA proportion scope. (Note: You may be surprised at the results!) As always, the accuracy of the calculations depends upon the accuracy of the input measurements. This math assumes a reasonably symmetric diamond with reasonably centered table and culet. First, find the tan and the cos buttons on your scientific calculator. On the calculator shown below, push the shift button and then the tan or cos to obtain the inverse tangent and cosign (tan-1 and cos-
JCK PRO

This content is exclusive to JCK Pro subscribers. Subscribe now to access this and much more with discount code GOPRO21 for $199 for an entire year of access (reg. $249).

SUBSCRIBE TO CONTINUE

Already a JCK Pro? Log in

A JCK Pro subscription is your all-access pass to people and resources on the
cutting edge of the retail jewelry industry, from the industry authority you
know and trust

Learn about the Perks of JCK Pro

Log Out

Are you sure you want to log out?

CancelLog out