[Nhcoll-l] Kunzite Display

[Robert Waller]

Hi Cortney,

Just as there is variability in the colors of kunzites there is variability
in their light-fading sensitivity. Those two variabilities arise for similar
reasons - differences in energy gaps between various electron 'traps' (see
Nassau 1992 In: F. Howie (ed.) Care and Conservation of Geological Material:
Minerals, Meteorites and Lunar Finds. Butterworth Heinemann, London, 1992).

 

Knowing the locality and collection date could lead to less uncertainty in
predicting light fading rate for your specimen - if you can draw on specific
experience from another collection - but it will not lead to certainty.

 

So what can we say?

*         It would be prudent to ensure there is no UV (even though it is
not certain that this would reduce fading it is the sensible precautionary
thing to do).

*         Have the specimen illuminated by visitors activating the specimen
light only while viewing. This is probably the most effective and
cost-effective conservation measure.

*         It would be sensible to not have higher light levels than
necessary for viewers to appreciate the specimen.

*         Monitor the color of the specimen carefully and reduce exposure
before a 'just noticeable fade' is realized. Measuring the color of a
transparent stone is far from easy and depends on what equipment you have
available. We could discuss off line.

Best,

Rob

 

Robert Waller, PhD, CAPC, FIIC

President and Senior Risk Analyst

Protect Heritage Corp.

622 Simoneau Way

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and, Research Associate, Canadian Museum of Nature

and, Adjunct Assistant Professor, Queen's University

           

 

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From: nhcoll-l-bounces at mailman.yale.edu
[mailto:nhcoll-l-bounces at mailman.yale.edu] On Behalf Of Zusin, Cortney
Sent: October 9, 2015 12:10 PM
To: 'nhcoll-l at mailman.yale.edu' <nhcoll-l at mailman.yale.edu>
Subject: [Nhcoll-l] Kunzite Display

 

Hello all,

 

I've had a request to loan a piece of early, very bright pink kunzite for a
museum exhibition.  Our chief gemologist has been unable to find any
concrete information for how quickly kunzite fades and under what light and
temperature conditions.  Would anyone be able to share guidelines for
displaying kunzite to prevent fading?  

 

Thank you!

Best,

Cortney

 

Cortney Zusin

Archives Registrar

Tiffany & Co. 

15 Sylvan Way

Parsippany, NJ 07054

T: 973-254-7206

F: 973-254-7205

 <mailto:Cortney.Zusin at tiffany.com> Cortney.Zusin at tiffany.com 

 

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