Vintage B.N. Silver, Blue Prong Set Stones Flower Burst Brooch, Earrings…

This is a vintage B.N. demi parure set that includes a starburst flower brooch and matching screw back earrings. The stones are a pretty cornflower blue. The centers are clear. The earrings are marked. The brooch is not. Very sparkly! Condition - excellent, however there is 1 tiny dark mark on one petal of the flower. I am not sure you can even see it in the picture. Unknown what it is. Brooch 2.5" Earrings 1" Jewels1-63 checked