Fine silver studs are formed and fired in my studio. They are soldered to sterling silver posts with sterling backs.

They measure about 4x4mm - they are tiny!

About fine silver:
Fine silver is 99.9% silver, which is pure silver. Sterling silver is 92.5% silver, combined with a copper alloy, which makes it more prone to tarnishing. Fine silver will not tarnish and will not irritate even the most sensitive of ears. Both are great options, but this is just a little explanation for those who have never heard of fine silver!