Vintage Black Onyx Pearl Set Earrings and Necklace from Winterthur

Gorgeous set of black onyx "pearl" earrings and necklace from Winterthur Museum in Wilmington, Delaware. I have three sets of jewelry from the same estate that all have Winterthur on the boxes with different information cards inside. This one doesn't have any care instructions, but another set has information about the museum and indicates that all the jewelry pieces from the museum are made from natural stone. Very lovely set and goes well with everything! Necklace is 30" long and earrings are 9mm or so in size.