Faceted Black Glass Clip On Earrings 1930s‎ marked "Japan"

Round faceted black glass earrings. Facets are triangular covering the domed surface of the earrings. Size of earrings is between 3/4 inch and 1 inch. Clip is marked "Japan" Vintage costume jewelry may have expected wear and tear for the age of the pieces. Photos are taken with effort to show the real condition of the pieces.