Surely Rough, Certainly Not a Diamond
"Diamond in the rough" = a person who is generally of good character but lacks manners, education, or style; a rough diamond.
Garrison Capital (GARS) is no diamond in the rough. This BDC is generally not of good character, and it lacks (price) stability, (dividend) safety, or (management) style. At best, GARS is a rough in the BDC-diamond-ship.
Over the past four years (since 11/29/2015), the total return that investors in GARS received hasn't only been terrible in absolute terms (-32.2%) but much worse in relative terms.