According to the well-known expert on jade identification and appraisal, Dr. Daphne Lange Rosenzweig, the value of jade antiques may be appraised through the following factors:
1.Physical properties:
a. identification and quality of the material
b. size and condition of the carving
2. Aesthetic properties:
a. quality of the workmanship
b. school, style and period characteristics
c. consideration of shape, subject, color, proportion and size
3. Extraneous properties</em>
a. provenance
b. market volatility and local taste
Dr. Rosenzweig stresses the necessary discipline of judging jade on its own merits and not by its pedigree or the important name of its former owner. Generally speaking, the jade antique to be collected must be those valuable items which are genuine with fine workmanship. (Source: Roger Keverne( Consultant Editor):Jade, Lorenz Books, 1995, pp.196-207) In order to carry out the actual appraisal, qualitative factors have to be transformed into quantitative measurements. Theoretically speaking, Delphi method has to be applied via pooling the opinions of group of experts. In practice, jade appraisal usually take market approach to evaluate a particular jade item by comparing prices of similar items sold in the market. If no market value may be found and before more sophisticated methods available, then the appraisal may be based on original purchase price multiplied by inflation index or use an inflation calculator.
Scientific jade appraisal methods have not been established. I have done a preliminary empirical study on jade appraisal presented to a 2011 conference in Taipei. In jade appraisal, objective criteria such as the methods of valuation of intangible assets should be established. The empirical regression model of my study is an attempt in this direction. In this study, weighted size index, and the quality index of 1 to 5 of subjective indicators showing workmanship, jade quality and perfection factor are treated as predictor variables in the regression equation. Finally, the study applies this model to the 505 Han Jades of auction house in 2009 using SPSS statistical software. The results have shown evidences of regression equation in line with the theory of the assumption that the greater size of the jade, the higher the composite indicator of jade, the higher its value. However, the establishment of the size indicator and comprehensive indicator is only in its preliminary stage, future researches should be further proceeded.
P.S. Prof.Mitchell Chen has published papers related to jade appraisal such as:
An Empirical Study on Art Works Appraisal- In the Case of Chinese Antique jades ( Presented to the 2010 International Conference of Business Innovation in Xiamen, China)
An Empirical Study on Chinese Antique Jades Identification and Appraisal (Presented to the 2011 International Conference of Chinesese Culture and Tourism, Taipei, Taiwan)
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