That is fascinating, and somewhat contrary to what I'd heard elsewhere--I know it's said that heat treatment on demantoids is a very low temperature process. I'd even heard numbers like 100c thrown around if I remember right. That aside, it is a rare treat to see such a nicely documented article on a treatment like this.
Post subject: Re: Russian Demantoid - Heat treatment
Posted: Sun Jan 03, 2016 4:08 pm
Gemology Online Veteran
Joined: Mon Jun 16, 2014 1:10 pm Posts: 850
Interesting and a question to our mayor labs - maybe Mr. Renfro or Mr. Smith can help - whether FTIR now helps to identify heat treated russian** demantoid with horsetail inclusion so many buyer and collector wanna see?
**
To my knowledge skarn hosted demantoid like Madagascar or Namibia show no fibers of asbest minerals. The serpentinite hosted D. show fibers ( Val Malenco, Iran, Pakistan) but not the horsetails like the russian stones ( don't know much about Canada and Californian D.)
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