that was "A War For All Seasons" from season 9. One of the worst episodes ever!! It just ignores Henry, Trapper, Frank and Radar and acts like they never even existed!!
It also takes whatever sense of a timeline they had, and just throws it out the window!!! (but, the timeline was so screwed up anyway, that doesn't really matter. It's still a bad episode though)
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the Clampetts are in a fancy Beverly Hills jewelry store. Granny points to a tray of rubies.
Granny: "How much fer one o' them red diamonds?"
clerk: "Madam, those are rubies."
Granny: "OK ask her kin we buy one offa her."
clerk: " The ruby I am talking about is not a lady."
Granny: "Lissen, how she got them diamonds is her business. I'm just sayin' ask her kin we buy one from her."