Rings within rings, each one turning around the last. A single stone bezelled at the centre, and from there the earring works outward in orbits. The first is mother of pearl, cut as a doughnut so the centre stone appears to float in shell rather than in metal. Then a ring of round brilliant diamonds.
A coloured stone set within a ring of mother of pearl, cut as a doughnut so the gem sits inside the aperture with shell all around it rather than metal. Round brilliant diamonds are set into the frame. Around the edge of that face runs a band set perpendicular to it, carrying a row of stones — and in the…
Here the whole head turns. Press a thumb against the row of stones standing perpendicular at the rim, and the entire face revolves — centre stone, mother of pearl and diamonds together — carried round by the band you push against. That perpendicular row is the mechanism as well as the ornament.