Investment in Gold

Recently I was introduced by a friend to invest in gold. There are several bank offering this service but i just monitor the price for 3 bank, namely CIMB, Public Bank and Maybank because these are the banks that i have saving account with.
From the 7 days i monitored, it seems like CIMB offer lowest rate (look at the column, delta). However, only Public bank has the online purchase/selling infrastructure which make things easier. There might be price changed in the afternoon, but in my table below, i just captured the daily morning price.

p/s: This is just for sharing, for more information, pls ask your bank :)