Our 14K Onyx and cultured pearl screw back earrings feature a spectacular design. I would date them at least back to 1930. It would be an easy chore for a skilled jeweler to change them over to pierced earrings.
The older vintage drops have an overall measurement of 1-1/2'' x 5/8''. Really quite striking with their cut out onyx and bezel set pearls accented with a border of Etruscan style bead work. Their posts feature an unusual and unique design more oval in form. They make an appealing contrast to their diamond shaped drops. All pieces are hallmarked 14K. I have not noticed any issues.