Overtone

Overtone is a quality in pearls in which one or two colors overlie the pearl’s body color. Not seen in every pearl, the most prevalent overtones are rosé and greenish or bluish tones.
Natural Pearl and Plique-a-Jour Enamel Grape Cluster Brooch.

Natural Pearl and Plique-a-Jour Enamel Grape Cluster Brooch with Rosé, Silver, Bronze, Peach, and Lavender Overtones.