GJ207-OOO - Jade: Identification, Treatments and Value
Category: Gems & Jewelry
Continuing Education: 4.8
Registration
Please see the "Upcoming Classes" tab for class offerings and registration information.
Course Description
As an appraiser you need to know that fake jade material started making its appearance, first in
Hong Kong and then later at the Tucson and other gem shows in 2011. It’s
marketed as “Canadian Jade” and looks similar to nephrite jade from British Columbia
or jadeite jade, but its dyed quartzite that could be identified under magnification,
plus using refractometer. Come to this lecture and workshop and
learn how to screen for A jadeite jade (natural colour), B jade (impregnated with polymer)
and C jade (dyed) using only UV lamp! You need to also know your limitations
using standard instruments in testing jade and when piece of Jadeite or
Nephrite Jade in question should be sent to gem laboratory for advanced testing with
VIS-NIR and Infrared spectrometers. This class will cover:
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Properties of Jadeite and Nephrite
Jade
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Varieties of jade by colour and
transparency
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Canadian Jade – main source of world’s nephrite
jade
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Separation of Jadeite Jade from Nephrite
Jade
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Identification and Jade imitations with
standard instruments
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Dying and impregnation of Jadeite
Jade
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Use of spectroscopy and microscopy in detecting
dyed jadeite jade
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Screening for Jade (A, B or C) with UV
lamp
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Testing of Jade with advanced instruments at
CGL-GRS Swiss Canadian gemlab
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Quality grading of Nephrite
and Jadeite Jade
- 4C: Colour, Cut, Clarity and
Cracks
- 2T : Transparency and Texture
- V : Volume
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Providing information on Jade pricing and
researching prices
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Assessing quality of carving and
artwork
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Disclosure of treated and imitation jades on
appraiser documents
Additional Information
- Samples of Jadeite and Nephrite Jades of
different types and quality, as well as common Jade simulants like serpentine,
dyed quartzite, glass, maw-sit-sit (mainly kosmochlor) and aventurine quartz
will be tested;
- Participants should bring their hand held
instruments: loupes, refractometers, filters, hand-held spectroscopes; and
- Each participant will receive
Letter of Completion by CGL-GRS and handout material of the
lecture.
No prerequisites for this course.
Deljanin, Banko | Vancouver, United States |
Yip, Angelina | |