Laboratory Manual Harmonization Committee (LMHC)
Information Sheets

The LMHC consists of seven of the world's major laboratories. They include the AGTA Gemological Testing Center (USA), CISGEM (Milan), GAAJ (Japan), GIA (USA), GIT (Thailand), Gübelin Gem Lab (Switzerland) and SSEF (Switzerland). For several years now, representatives of these laboratories have met to discuss the harmonization of identification procedures and wording on gemstone reports.
     To date, the LMHC has issued the following harmonization documents:

Document Date
Information Sheet 1 – Flux-healed corundum 03/24/04
Information Sheet 2 – Lattice-diffused corundum 01/27/04
Information Sheet 3 – Glass-filled corundum Updated Jan. 2006
Information Sheet 4 – Padparadscha sapphire Implemented Jan. 2006

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© 1999–2005 American Gem Trade Assocation Gemological Testing Center. All rights reserved. Users may download this information for their own private, non-commercial use. Any other reproduction of this document (text or graphics) without the express written consent of the AGTA GTC is strictly prohibited.
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