I said that Ruby and Pearl's fusion would probably be, Carnelian.
Carnelian is also the stone for Singer's and Performer's probably contributing to Sardonyx's entertaining personality! All of Pearl's fusions like to perform and somewhat show off. With Ruby's passion and aggression, they'd be highly competitive and would be huge show offs.
I believe Carnelian is capable of breathing fire and that their weapon is similar to this;
¡Ay! Esta imagen no sigue nuestras pautas de contenido. Para continuar la publicación, intente quitarla o subir otra.
It's a fire baton/staff. I believe that Ruby's gloves go on either side of Pearl's spear and they light it on fire by breathing fire on the gloves. I believe Carnelian would be dressed like a fire dancer/ breather.
*Spoiler Below*
Also, Alexandrite was able to breathe fire during the battle scene with Malachite and we know that she gets her abilities from the individual gems and all of their fusions.
¡Ay! Esta imagen no sigue nuestras pautas de contenido. Para continuar la publicación, intente quitarla o subir otra.