14 x 18 mm Oval Black and Green Agate Slice Glass Magnetic Clip Non Pierced or Pierced Earrings
These look like geode slices in green and black but they are made of glass.:
They are 14 x 18 x 6 mm high.
The magnetic style is held on the ear with one nickel plated 5 mm neodymium magnet attached to the earring and one 8 x 3 enamel painted ceramic magnets that goes behind your ear to hold it on.
Also available in pierced with surgical steel posts and nickel free backs. Pierced earrings are not returnable as they are a custom order.
Need extra or stronger magnet backs? They are listed here:
Remember: The wider the magnets, the more comfortable the earring is.
If you have misplaced your metric ruler, remember that 13 mm=1/2 inch.
If you are allergic to nickel, order only earrings that have both enamel painted ceramic magnets front and back since the neodymium magnets are plated with nickel.