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 | Updated Dec. 2006 |
| Information Sheet 5 – Emerald fillers | Implemented Jan. 2007 |
| Information Sheet 6 – Paraíba tourmaline | Implemented Jan. 2007 |
| Information Sheet 7 – Corundum: unheated vs. heated | Implemented Jan. 2007 |
