A round pearl on a post, 4.7mm across and standing the same height off the ear, so she reads as a full sphere and takes light right around her edge.

We took her for the size. Pearls were the most valuable gem in the Roman world, long before anyone worked out how to cut a diamond, and a plain white pearl still does something no faceted stone can. She works as the only earring in a first hole, or as the small one that finishes a second or a third.