Earrings make the perfect present because they don't really have to be sized. You just need to decide whether you're looking for ear-wires, hoops or studs, and there are a few of each on this page

Catherine's Hoops
Planished hoop earrings. I make these with a few different textures but the one shown is my favourite
These were originally made for a doctor friend who wanted something small enough to wear in the hospital. I failed, because these were still too big, but I liked them so I carried on with the design

Gingko Earwires
Handmade in sterling silver, these earrings start life as a sheet of metal which is first cut and then textured to resemble the leaf of the Gingko Biloba tree. The stem is then set into the leaf so it looks like one piece of metal and the leaf is attached to the handmade earwire before final polishing
Then I make the other one...
Also available with a stud fitting if you'd prefer?