Thread:Lilduders/@comment-5782071-20160128005950/@comment-5782071-20160130010410

I'm not sure if this has been added to the wiki yet, but Sapphire and Ruby's instruments have been confirmed.

http://noisey.vice.com/blog/steven-universe-composers-aivi-surrashu-interview

"Ruby is a crude waveform in between a square and a saw wave, and Sapphire is a gentle synth pad."