I tried in two branches of ICICI Bank in Bangalore. While one branch straight away rejected from even taking up the issue of upgrade of Emeralde (plastic) card to Emeralde Private card, another branch asked me to wait 2 days while they cleared up from senior people, and then said that they can only upgrade if I hold an account in ICICI Bank (which I do not) (but didn't clarify exactly how much investments or savings should be in ICICI account) , and said to continue using my Emeralde card and wait for pre-approved offer in ICICI internet banking and imobile app.