1970s(?) kitsch adventure movie, bad guy tries to strangle exotic woman with her necklace in order to steal it.

I always remember a scene from a movie I watched as a child in the mid – late 1970s.  It was an adventure movie and I can only compare it to something like “Journey to the Center of the Earth” as it appeared to be a group of people on an adventure deep in the bowels of the earth.  There was a woman who I recall had ’70s style afro hair and she was playing some kind of exotic tribal woman, perhaps a princess or important woman of standing.  She wore a prominent necklace which was obviously extremely valueable because one guy in the group (who turned out to be a bad guy) was lusting after this necklace.  At one point the ‘exotic woman’ was either sleeping or semi-conscious when injured and this bad guy crept up on her and tried to steal her necklace, I think he may even have tried to choke her silently with it in order to steal it.  He was heard however and the rest of the group forceably stopped him and the woman was saved.  I keep thinking that it was the 1959 “Journey to the Center of the Earth” movie or a Doug McClure 1970s movie like “The Land That Time Forgot”, “The People That Time Forgot” or “At The Earths Core”… but the few movie clips I’ve seen online from these films don’t seem to show any kind of woman as I’ve just described… i.e. a kind of Nichelle Nichols but with curly hair and as an exotic tribal princess!!!! 😀   Perhaps my mind is playing tricks on me, but I’d love to know what movie this is and where I can find it.  Any ideas?  Thanks so much for any help! 🙂

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