11mm across (about 7/16 across). It is water resistant but should not be submerged in water.
This unique piece is only found at Bug Under Glass and I hand-craft every piece in my San Francisco insect studio. My business is a San Francisco Green Certified Business and uses only sustainably raised insects.
see all my butterfly wing jewelry:
This real butterfly wing ring is a thing of beauty. I can make a ring out of any butterfly you see in my store.