The Solid 14k Gold Trilogythreadless ends are available in solid yellow gold, rose gold, or white gold with a stainless steel threadless post
The Sterling Silver Trilogy threadless end is available in solid un-plated silver, yellow gold plated sterling silver, rose gold plated sterling silver, and gunmetal ceramic plated silver, all with a stainless steel threadless post.
The Trilogy threadless end design measures approximately 5mm tall by 5mm wide.
More threadless jewelry can be found here.