Who is entitled to Italian Citizenship?
Italian citizenship is transmitted by blood ( yuri sanguinis ), from one generation to another, without generational limits. If you have an Italian ancestor, you can apply for recognition through documentary evidence in accordance with the law, however, there are some exceptions.
when exist woman in the family tree passing on the Italian citizenship,
ex: great-grandmother, grandmother, mother. They will only be able to transmit Italian citizenship to their child if that child was born after 01/01/1948, the time of the promulgation of the Italian Republic.
Before that, women lost their Italian citizenship when they married a foreigner. There is a little confusion on the subject and many feel that the woman herself must have been born after that date and it is not her, but her child, as she can receive Italian citizenship if she receives it from her father, she just cannot pass it on to her next descendants.
So, if you only have the great-grandmother as Italian, the transmission will only continue and can reach you if her son, ( in case your grandfather or grandmother ) was born after that date 01/01/1948. Otherwise, some lawyers are getting recognition through Italian justice. The process takes longer from 2 to 4 years and more expensive around 5,000 euros, but it's worth it because you don't have to go to Italy.
The other exception is for the descendants of called “Trentines” whose Italian citizenship was granted until 2010. This territory belonged to the former Austro Hungaro empire that became part of Italy after the war, immigrants from the provinces of Trento and Gorizia. if you want more information about this case see: