OCT technology has been used to evaluate both the quality and authenticity of  pearls. This evaluatoryt system is based on swept-source OCT (SS-OCT). Experimental results verify the feasibility of using OCT for evaluating, analyzing and identifying pearls without damaging them.

Additional general information:

1. Non-invasive Pearl Assessment Device (video)
2. Evaluating and identifying pearls and their nuclei by using optical coherence tomography
3. Non-invasive imaging aparatus