The Solid 14k Gold Trinary threadless end is available in solid yellow gold, rose gold, and white gold with a stainless steel threadless post.
The Sterling Silver Trinary threadless end is available in solid un-plated silver, yellow gold plated sterling silver, or rose gold plated sterling silver with a plated stainless steel threadless post.
The Trinary end design measures approximately 4.5mm tall by 4.5mm wide.
More threadless jewelry can be found here.