"Wearing of the Green" should rank as one of the worst episodes of "Murder, She Wrote". This is because someone obviously had some sort of axe to grind and they let it hurt the episode as a result.
Jessica is investigating the diamond business for an upcoming book. However, when a valuable tiara is stolen, the two most annoying and stupid detectives are assigned to the case...and make a complete mess of it. Of course, Jessica helps these dim-wits figure out what's going on in the episode.
The dim-wit detectives, Stacey and Chadwick (Lucie Arnaz and Patty McCormack) are obviously supposed to be a parody (or outright attack) on the popular 80s' TV show, "Cagney & Lacey". While I was no fan of that show, it just seemed awful to make these two knockoff cops THAT grating and dim...especially Detective Stacey....with her less than subtle Brooklyn accent and grating manner. As a result of these cops being so annoying, the actual crime is greatly overshadowed. The bottom line is that Stacey and Chadwick are unfunny and irritating. If you were to skip an episode, this one would be the one I'd choose.
By the way, since this episode was aired, I haven't seen a lot of Lucie Arnaz and perhaps characters written like this are why. It couldn't help but harm her career.