Thanks for the links. I was very disappointed when Carapina closed their shop on Via dei Chiavari, next to Forno Roscoli.
I can vouch for Pico Gelato & Otaleg from that list
A few tips to tell if a gelato shop is selling the real thing. Any yes'es and it should be a red flag
Are there 101 different flavours?
Are the gelatos brightly colored?
Is the pistachio bright green?
Katie Parla hasn't done a top list for 2017, but she has a 2016 & 2015 list
http://www.foodandwine.com/travel/best-gelato-rome
I like Gelateria del Teatro, Fatamorgana & Fior di Luna