The role of Giuditta, widow of Manasseh, was written for the alto voice, and in this performance the Serbian contralto, Marijana Mijanovic, takes on the role. The tessitura is perfectly set for the contralto voice, with low passages which cry out for the dark, smoky timbre of the contralto chest register.
If you want to follow the score, you can see it at the IMSLP website. I hope you enjoy the wonderful videos uploaded by the YouTube user ssiroe.
The first aria is "Del pari infeconda" which has a range of G3 to D5. Listen to the wonderful strength of Mijanovic's low tones.