If her name is Goldstone, why is she blue?"
|—Amethyst, Iolite, and Angel about Goldstone's colour, "A Keystone Trip", Crystal Island Adventures|
Goldstone is one of the gem engines from the Keystone Railway.
Iolite and Angel have stated that she is very authoritative, but also very kind and friendly. It was also stated that she tends to take charge.
Goldstone is painted light blue with gold lining. She has a gold bufferbeam/footplate, gold wheels, a gold dome, and black tender wheels. She also has a light blue gemstone with gold specs on her tender.