[@The ghost in black] Oh yeah, I knew that. I always thought Howlite and Pyrite (Fool's Gold) would be a cool pair, since they all are mistaken for their more monetarily valuable look-alikes, being Turquoize, and Gold alike, and  Zirconia and Opalite would also make a cool pair since they're in the same situation (Diamond and Opal in this case), but share the trait of both being synthetic gems. But that's just me, I suppose. 
^ ^"