I don't really know anything about the royalty of Malaysia but I've been browsing the internet and found a few cool pictures.
This is the Sultan of Johor's wife, Raja Zarith Sofiah. picture from here
Che' Puan Khaleeda Binti Bustamam, the Sultan's eldest son's wife, is on the far left. She appears to be wearing the same tiara but it is difficult to tell. picture from here