I say those words the same way as hyperpape. I don't think either of those are a dipthong. I think dipthong has two different vowel sounds that squish together, like boy or lair.

I edited my initial post. it was wrong I thought the english would pronounce siege the same as the french. Which is not the case.

I'm not sure what a dipthong is, but diphthong is used differently in different fields... At any rate, cyclops probably meant diaresis, not diphthong.