There are two styles -- with a screw-back (top left), you adjust the grip of the piece on your earlobe! The front is a slim, simple bar style. Available in sterling silver (additional $20) or 14k gold-filled (additional $25). These clipon earrings are perhaps the most comfortable, since you can easily control the pressure of the clip on your ear.
Then there are the traditional spring-back (earrings on top right) clip on style. The earring opens and has a spring-like effect that helps it close and grip your earlobe. These are available in sterling silver and 14k gold-filled (additional $15). These are also slightly adjustable -- squeeze the earring pad to loosen the pressure on the clip on piece of the earring.
Most PLC styles are adaptable to a clip on earring top. Please email me at firstname.lastname@example.org inquire about this special order.