LMHC Standardised Gemmological Report Wording (version 5; December 2014)

LMHC Information Sheet # 8

Gemstones where colour authenticity is undetermined

Members of the Laboratory Manual Harmonisation Committee (LMHC) have standardised the wording they use to describe cases where colour authenticity is undetermined. These situations typically apply to beryl, demantoid garnet, quartz, spodumene (kunzite), topaz, tourmaline, zircon, zoisite (tanzanite), etc.

Gemstones which are commonly heated and/or irradiated, but whose treatment, or lack thereof, is typically not determinable or has not been determined, shall be described as,

Identification: Species: (Natural)1 [Species]2 Variety: [Colour3, Variety4]

Further information5: [Gemstone]2 is commonly heated and/or irradiated6 (to improve or change the colour)1

and/or

Colour authenticity is currently undeterminable,

or

Colour authenticity has not been determined.

1 wording and text in parenthesis is optional 2 Insert the recognized species name 3 Insert colour when appropriate 4 Insert the recognized variety name 5 This information may be on the report or in an attachment 6 Use heated and/or irradiated as appropriate

© Laboratory Manual Harmonisation Committee. This document may be freely copied and distributed as long as it is reproduced in its entirety, complete with this copyright statement. Any other reproduction, translation or abstracting is prohibited without the express written consent of the Laboratory Manual Harmonisation Committee.

All rights jointly reserved by: Central Gem Laboratory CGL (Japan), CISGEM Laboratory (Italy), DSEF German Gem Lab (Germany), GIA Laboratory (USA), Gem and Jewelry Institute of Thailand GIT (Thailand), Gübelin Gem Lab Ltd. (Switzerland), Swiss Gemmological Institute - SSEF (Switzerland)

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