One Topaz has her gem on the left side of her head, and the other has her gem on the right side. When fused, their gem is on each side of their head.
Topaz yields a mace from their gem, however, their primary form of attack is engulfing humans in their fusion. The Topaz gems never speak.
Topaz is a massive quiet quartz soldier as she have never spoken so far in the show. She is very aggressive and careless about humans as she was about to eliminate Jamie in order for the crystal gems to tell them where is My Dad.