The West Ham co-chairman has been discussing the 28-year-old Argentine.
Zarate left West Ham this week, moving to Italy, and Gold was full of praise for him after he completed his switch away from east London.
Gold said in his regular 'From the Boardroom' column: "Mauro has left the club for a new challenge in Italy. I first saw him play at Birmingham as a young man and we knew he would be a good player.
"We wish him well in his new adventure at Fiorentina and I thought his message on leaving the club was one of the warmest I have seen in all my years in football, with the exception of Jack Collison whose heartwarming message will never be forgotten."
Zarate's time at West Ham was strange.
The Argentine went from periods where he was loved by the Hammers faithful to times when he was almost despised.
His West Ham career included a loan spell away at Queens Park Rangers - where he barely featured - but also included memorable goals, such as against Arsenal during the opening day of the current Premier League season.
Now that he has left Upton Park, it looks as though the 28-year-old will be well remembered, especially after ending things on such a good note.