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51 chrysoprase gemstone samples and 676 synthetic green reference points measured for CIE L*a*b* color values using an X-Rite SP62 spectrophotometer. Author Yuansheng Jiang published this dataset on figshare under a CC-BY-4.0 license, last updated on 2026-05-15. The data was used to train and validate machine learning models, including logistic regression and neural networks, for objective gemstone color grading.
Data is provided in an XLS (Excel) format. A companion grading application is available on GitHub.