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Fakes & FraudsGreenish Yellow Colored Citrine

17th Jun 2019 01:07 BSTYoung Collector

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Hello, my question is regarding if all greenish yellow colored citrine is smoky quartz that has been heat treated?


Or if smoky citrine is heat treated, are the results a greenish yellow color?


I invested a great sum of funds into the attached "natural citrine" pieces.


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17th Jun 2019 03:09 BSTSteve Hardinger Expert

The colors appear natural but the shape appears cut and polished.

17th Jun 2019 03:45 BSTWayne Corwin

Welcome to Mindat Young Collector!


They may or may not be "natural citrine",,, but they arn't natural crystals, just cut and polished to look like one, somewhat.

17th Jun 2019 10:22 BSTBenjamin Oelkers

The greenish yellow colour with some "smoky" mixed in is usually a sign for a natural citrine, classic heat treatment would use poor quality amethyst and result in rather orange looking "citrine". Of course, there may be other methods for changing the colour, but the most prevalent (heating of amethyst) seems unlikely to me in this case. You can test for this specific treatment by using polarized light: Natural citrine will show (weak) dichroism, i.e., the colour changes slightly when turning the specimen (every 90°). A simple way to test that is to hold the specimen in front of a computer screen (most will work, but maybe not all of them) showing only white in a dark room and slowly rotate it.

17th Jun 2019 10:33 BSTBenjamin Oelkers

Rotate the specimen. Well, you could rotate the screen instead for the same effect... ;-)

22nd Jun 2019 20:19 BSTYoung Collector

Thank you everyone for your insight!

4th Jul 2019 01:32 BSTcascaillou

here's a guide to quartz treatments: https://www.mindat.org/mesg-62-369000.html


Heat and/or irradiation treatment can produce such color, which can also occur naturally.

27th Jul 2019 18:59 BSTAymeric Longi

For more information about quartz The Quartz Page
 
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