Each diphthong is given with its Revived Middle Cornish (RMC) and Revived Late Cornish (RLC) pronunciation.
In modern standard Italian spelling, only Latin words, proper nouns (such as Jesi, Letojanni, Juventus etc.) or those of foreign languages have J. Until the 19th century, J was used instead of I in diphthongs, as a replacement for final -ii, and in vowel groups (as in Savoja); this rule was quite strict for official writing.