Zoisite is Kunzite's boyfriend and the most eficient henchman of all shitenōu. He first wanted to work with Nephrite how received the kurozuishou (dark cristal) because he need that thing to do his job. Beryl liked the idea but Nephrite never recognized Zoisite's value. A disapointed Zoisite start to bore Nephrite everyday. After to meet Kunzite (episode 22) and discover about Nephrite's relationship with Naru Osaka (episode 23) and see that Nephrite was only wasting time doing shit with the kurozuishou he sent a yōma group in the order to kill the traitor (episode 24) and get the stone needed. After it all Zoisite found the seven nijizuishou (Raibow Crystals) and do got the ginzuishou for a moment. Nobody in the Negaverse could do the same. (I love the japaneese version with Keich Namba's gay voice. lol)