Your question implies that there is only one diphthong in classical Latin. There are actually six:
ee
The Latin dipthong ae is pronounced "-ay" as in "say". Thus, Phaedo is pronounced "Fay-doh."
ameesisiimus
PRY.
You would say milly- tes to pronounce milites.
a big dipthong
dipthong
viridis
In general, languages that do not include the pronunciation of the letter "v" include Hawaiian, Samoan, and some Indigenous Australian languages. Additionally, some dialects of Arabic and Chinese may also lack the distinct pronunciation of the letter "v".
communicare
pull kair
The Latin word for wolf is lupus, pronounced loo puss
in classical latin, it is pronounce spayss In ecclesiastical latin it is pronounced spayz