One of the jornalists at the broadcast of the wedding confirmed the provenance of the emerald earrings worn by the bride at the wedding dinner.
The diamond earrings belonged to her late grand-mother Duchess Maria Francisca. The large center diamond from one of the earrings was used to make the engagement ring, and in both earrings the groom had the center diamonds replaced by two emeralds.
I believe they are these ones, worn by Dona Isabel several times. On the left, the Duchess at the wedding of Pc Albert and Pss Charlene of Monaco in 2011