Gemology’s Outer Limits

Despite all the grumbling over price lists and grading reports, the diamond industry has had it relatively easy. While the colored-gem market has been roiled by treatments and synthetics, the diamond scene has had to deal only with fracture-filling and the occasional simulant like cubic zirconia and moissanite. But now all that is changing. Recently, noted diamond dealer Lazare Kaplan International threw the industry for a 10-power loupe with a mysterious process that purportedly improves a diamond’s color and brilliance. The company won’t describe the process, citing a confidentiality agreement with the process’s developer, General Electric. (GE won’t comment, either.) But most experts think the process is annealing, a high-pressure, high-temperature treatment that improves a diamond’s color and sometimes its clarity. (LKI denies that clarity is affected.) Whether or not tha

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).


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