Short answer: Taylor Swift has been photographed wearing Cartier pieces (notably the Panthère de Cartier and a Santos/Demoiselle), so you can either buy genuine Cartier in Australia (Cartier boutiques / authorised retailers or the pre‑owned market) or get Cartier‑inspired/“Tank/Panthère‑style” watches from mainstream watch and department stores. Below are specific Australian places and the kinds of options they carry.

Where to buy the real thing (Cartier) in Australia

• Cartier boutiques (Sydney, Melbourne, Brisbane, Perth etc.) — Cartier’s official Australia boutique listings and flagship info. (stores.cartier.com)
• Luxury/authorised retailers that stock Cartier (and other high‑end brands), e.g. Kennedy and Watches of Switzerland. (kennedy.com.au)
• Pre‑owned / secondary‑market dealers that commonly list discontinued Cartier models (helpful if you’re after a rare Santos Demoiselle or diamond Panthère): Watchfinder (official Cartier pre‑owned partner), Wristies and international pre‑owned marketplaces like Farfetch/Chrono24. (watchfinder.com.au)

Where to buy Cartier‑inspired (more affordable) watches in Australia

• Longines DolceVita — a rectangular/“Tank‑style” Swiss alternative; sold through authorised Australian watch retailers such as Kennedy, Monards and Wallace Bishop. (mid‑luxury