I love Roberto Coin, have many of his pieces.There are so many other beautiful jewelry beside the typical VCA/TIff/Cartier and better for your wallet.
Some of my fave mall brands ( you can find some of them on sale or on promotion), based on design are:
Italian/ modern design: Pomellato , Marco Bicego, Roberto Coin
American design: Suzanne Kalan, Anita Ko, Sara Weinstock
Asian design: John Hardy ( only their gold jewelry), Mimi so