Does the quality of cultured pearls from the black-lip pearl oyster, Pinctada margaritifera, improve after the second graft?

This paper presents novel new information on whether P. margaritifera that produced circled pearls after first grafting will produce pearls with improved quality when re-grafted. It clears the confusion among pearl farmers on the decision of whether or not to re-graft P. margaritifera that produced low quality pearls with high number of circles. Overall, the study has a positive impact on pearl aquaculture.