Here's a breakdown:
Rising Diphthongs:
* ɪə (ear) - as in "beer"
* eɪ (ay) - as in "say"
* ɔɪ (oy) - as in "boy"
* aɪ (eye) - as in "buy"
Centring Diphthongs:
* ʊə (ur) - as in "tour"
* ɪə (ear) - as in "here"
Other Diphthongs:
* eʊ (ow) - as in "go"
* aʊ (ow) - as in "house"
Note:
* Diphthongs are sounds that involve a glide from one vowel to another within a single syllable.
* Some sources might list a few more diphthongs, but the 8 mentioned are the most common and widely recognized.