Sir Master Diamond

"You're Manny Ah Yes Is Be It Been 24 Years Since I First Met You"
Sir Master Diamond is one of the Gem Knights that protect Gem Homeworld from any harm since was His family was residential there which so during the rebellion He was good friend to Rose who gave up her form it is questionable to get Information
But also before Manny was brought to trial on Rose's crimes and moment Sir Master Diamond realized, He quickly stand up to Yellow Diamond and Blue Diamond demanding on letting him free and Manny has nothing to do with Rose's crimes in way so later He found him not guilty