Short answer: Taylor Swift has been photographed wearing Cartier pieces (notably a diamond-set Santos Demoiselle and Panthère de Cartier). If you want that exact look you can buy from Cartier’s Singapore e‑boutique or from reputable pre‑owned dealers; if you want lower‑cost “Cartier‑inspired” rectangular/square watches there are many Singapore online fashion marketplaces that sell Tank/Santos‑style designs. Sources and concrete options below.

What Taylor Swift wore (models)

• Photos/reports show Swift wearing a diamond Santos Demoiselle and Panthère de Cartier pieces. (businessinsider.com)

Where to buy authentic Cartier in Singapore

• Cartier (official Singapore e‑boutique / boutiques) — for new, authentic Santos / Panthère / Tank models. (cartier.sg)

Authorized retailers and reputable dealers (new or honest alternatives that echo the Cartier aesthetic)

• The Hour Glass (Singapore) — carries rectangular/ladies collections such as Longines DolceVita (a Tank‑like rectangular design from another Swiss brand). (thehourglass.com)
• Cortina Watch (Singapore) — official dealer listings for rectangular Longines and other prestige brands. (cortinawatch.com)
• Sincere Fine Watches (Singapore) — Longines DolceVita and similar rectangular pieces. (sincerewatch.com)

Pre‑owned / resale marketplaces (authentic discontinued Cartier models show up here)

• Chrono24 (global marketplace with listings in/for Singapore) — often lists discontinued Cartier Santos / Tank and other genuine pre‑owned pieces. (chrono24.sg)
• Luxehouze / local pre‑owned watch sellers — examples of Singapore platforms selling authenticated pre‑owned rectangular watches. (luxehouze.com)

Affordable “Cartier‑inspired” options (fashion brands & marketplaces in Singapore)

• Zalora Singapore — wide selection of fashion watch brands (Fossil, Daniel Wellington, Ted Baker, Paul Hewitt, etc.) and many square/rectangular designs that give a Tank‑like look. Good for inexpensive, styled pieces. (zalora.sg)
• Lazada Singapore and Shopee Singapore — large marketplaces where many sellers list “square/rectangular” or “Cartier‑style” / “Tank‑style” fashion watches and inexpensive replicas or inspired designs (use caution on authenticity). Example Lazada watch listings and watch sellers. (lazada.sg)
• Qoo10 Singapore and Etsy — another places to find vintage Tank‑style watches, small brands and handmade / vintage pieces with the rectangular look. (qoo10.com)

Quick tips and cautions

• If you want the exact Taylor Swift pieces (Santos Demoiselle / Panthère), those are Cartier and carry luxury prices (reports cite prices in the many‑thousands; discontinued diamond versions resell for very high amounts). (businessinsider.com)
• “Inspired” = OK from fashion brands; “replica”/“counterfeit” = illegal/unreliable and often poor quality — avoid sellers advertising exact Cartier logos or serial numbers. For safer buying, use official boutiques, authorised dealers, or established resale platforms that authenticate watches. (See Chrono24, local authorised dealers above.) (chrono24.sg)
• Useful search terms when shopping: “rectangular watch”, “square watch”, “Tank‑style”, “Santos‑style”, “DolceVita” (Longines), “Reverso” (Jaeger‑LeCoultre) — then filter by seller ratings, returns policy, and authenticity guarantees.

If you’d like, I can:

• Find specific live listings (example “Tank‑style” watches under S$100–S$300) on Lazada / Shopee / Zalora and paste links; or
• Search for authenticated pre‑owned Cartier Santos/Tank listings available to ship to Singapore right now.

Which would you prefer?