Related Experiment Videos
[Identification of B jade by Raman spectroscopy]
En-dong Zu1, Da-peng Chen, Peng-xiang Zhang
1Engineering School of Material, Kunming University of Science and Technology, Kunming 650051, China.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|August 28, 2003
Summary
Raman spectroscopy non-destructively identifies polymer-impregnated jadeite (B jade) by detecting characteristic resin peaks. This method distinguishes treated jade from natural gemstones, aiding gemological analysis.
Area of Science:
- Gemology
- Spectroscopy
- Materials Science
Context:
- Jadeite is often treated with polymers to improve clarity, creating 'B jade'.
- Distinguishing treated jade from natural jade is crucial for authenticity and value.
- Traditional gemological methods may be destructive or inconclusive for identifying treatments.
Purpose:
- To establish Raman spectroscopy as a reliable, non-destructive method for identifying polymer impregnation in jadeite.
- To differentiate between various organic fillers (resins, oils) and natural jadeite.
- To identify specific spectral markers indicative of resin treatments.
Summary:
- Raman spectroscopy analyzes the chemical composition of inclusions and fracture fillings in jadeite.
- Characteristic spectral peaks between 1,200-1,700 cm-1 and 2,800-3,100 cm-1 identify organic fillers.
- Specific phenyl-related peaks (1,116, 1,609, 1,189, 3,069 cm-1) distinguish resins from paraffin wax.
Impact:
- Enables non-destructive identification of treated jadeite (B jade).
- Provides a reliable method for gemologists to verify gemstone authenticity.
- Contributes to the accurate classification and trade of jade materials.