Professional Jeweler Archive: Powder Power

August 2001

Professional Bench/The Path to Proficiency

Powder Power

Colored spray reveals high spots that require further work

Did you ever wish there was some way to be sure the seat you prepared for a gemstone was the proper fit? Jeffrey Mathews received this proficiency tip from an audience member at a recent JA Masters in Motion event. It involves Seat Check, a bright green powder spray that is easy to apply, works efficiently with all gemstones and metals and, when used properly, reveals high spots on seats or bearings for gems.

Take a Powder …

Steps for the use of disclosure powder:

  1. Bur a seat for a gemstone that will be set in prongs, bezels, channels or another application.
  2. Spray the area where the gem will be set with Seat Check disclosure powder from Rio Grande.
  3. Place the gem in the seat and “wiggle” it slightly.
  4. This motion removes the powder from high spots the gemstone touches, revealing areas where you must remove more metal.
  5. Seat Check can be removed using an ultrasonic or spray from a steam cleaner.

For more information on Seat Check, visit For more information about JA’s Bench Jeweler Certification visit or call (800) 223-0673.

– by Mark B. Mann, Director of Trade Programs, Jewelers of America®

Featured Application by Jeffrey Mathews
JA Certified Master Bench Jeweler™
Jeffrey Mathews Designs, Dallas, TX

Photographs courtesy of Jewelers of America
© 2001 – Jewelers of America

Copyright © 2001 by Bond Communications