Rapid detection of color-treated pearls and separation of pearl types using fluorescence analysis

Imaging-assisted Raman and photoluminescence spectroscopy for diamond jewelry identification and evaluation

Jewelry identification and evaluation are limited owing to interference from the surrounding metal mount and adjacent gemstones. To maintain transparency in the jewelry market, this study proposes imaging-assisted Raman and photoluminescence spectroscopy for jewelry measurement. The system can automatically measure multiple gemstones on a jewelry piece sequentially, using the image as a reference for alignment. The experimental prototype demonstrates the capability of noninvasive measurement for separating natural diamonds from their laboratory-grown counterparts and diamond simulants. Furthermore, the image can be used for gemstone color evaluation and weight estimation.